1.
Anti-aircraft warfare
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Anti-aircraft warfare or counter-air defence is defined by NATO as all measures designed to nullify or reduce the effectiveness of hostile air action. They include ground-and air-based weapon systems, associated sensor systems, command and control arrangements and it may be used to protect naval, ground, and air forces in any location. However, for most countries the main effort has tended to be homeland defence, NATO refers to airborne air defence as counter-air and naval air defence as anti-aircraft warfare. Missile defence is an extension of air defence as are initiatives to adapt air defence to the task of intercepting any projectile in flight, a surface-based air defence capability can also be deployed offensively to deny the use of airspace to an opponent. Until the 1950s, guns firing ballistic munitions ranging from 20 mm to 150 mm were the weapons, guided missiles then became dominant. The term air defence was probably first used by Britain when Air Defence of Great Britain was created as a Royal Air Force command in 1925. However, arrangements in the UK were also called anti-aircraft, abbreviated as AA, after the First World War it was sometimes prefixed by Light or Heavy to classify a type of gun or unit. Nicknames for anti-aircraft guns include AA, AAA or triple-A, an abbreviation of anti-aircraft artillery, ack-ack, NATO defines anti-aircraft warfare as measures taken to defend a maritime force against attacks by airborne weapons launched from aircraft, ships, submarines and land-based sites. In some armies the term All-Arms Air Defence is used for air defence by nonspecialist troops, other terms from the late 20th century include GBAD with related terms SHORAD and MANPADS. Anti-aircraft missiles are variously called surface-to-air missile, abbreviated and pronounced SAM, non-English terms for air defence include the German FlaK, whence English flak, and the Russian term Protivovozdushnaya oborona, a literal translation of anti-air defence, abbreviated as PVO. In Russian the AA systems are called zenitnye systems, in French, air defence is called DCA. The maximum distance at which a gun or missile can engage an aircraft is an important figure, however, many different definitions are used but unless the same definition is used, performance of different guns or missiles cannot be compared. For AA guns only the part of the trajectory can be usefully used. By the late 1930s the British definition was that height at which an approaching target at 400 mph can be engaged for 20 seconds before the gun reaches 70 degrees elevation. However, effective ceiling for heavy AA guns was affected by nonballistic factors, The maximum running time of the fuse, the capability of fire control instruments to determine target height at long range. The essence of air defence is to detect aircraft and destroy them. The critical issue is to hit a target moving in three-dimensional space, Air defence evolution covered the areas of sensors and technical fire control, weapons, and command and control. At the start of the 20th century these were very primitive or non-existent
2.
Battery nomenclature
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Standard battery nomenclature describes portable dry cell batteries that have physical dimensions and electrical characteristics interchangeable between manufacturers. The long history of dry cells means that many different manufacturer-specific and national standards were used to designate sizes. Technical standards for battery sizes and types are set by organizations such as International Electrotechnical Commission. Popular sizes are referred to by old standard or manufacturer designations. The complete nomenclature for the battery will fully specify the size, chemistry, terminal arrangements, the same physically interchangeable cell size may have widely different characteristics, physical interchangeability is not the sole factor in substitution of batteries. National standards for dry cell batteries have been developed by ANSI, JIS, British national standards, civilian, commercial, government and military standards all exist. Two of the most prevalent standards currently in use are the IEC60086 series, both standards give dimensions, standard performance characteristics, and safety information. Modern standards contain both systematic names for types that give information on the composition and approximate size of the cells. The International Electrotechnical Commission was established in France in 1906 and co-ordinates development of standards for a range of electrical products. The IEC maintains two committees, TC21 established in 1933 for rechargeable batteries, and TC35 established in 1948 for primary batteries, the current designation system was adopted in 1992. Battery types are designated with a sequence indicating number of cells, cell chemistry, cell shape, dimensions. Certain cell designations from earlier revisions of the standard have been retained, the first IEC standards for battery sizes were issued in 1957. Since 1992, International standard IEC60086 defines an alphanumeric coding system for batteries, British standard 397 for primary batteries was withdrawn and replaced by the IEC standard in 1996. Standardization of batteries in the United States started in 1919, when the US National Bureau of Standards published recommended test procedures, the first American Standards Association standard C18 appeared in 1928. It listed cell sizes using a code, roughly in order of size from smallest to larger types. The only numerical designation was the 6-inch tall No.6 cell, the 1934 edition of the C18 standard expanded the nomenclature system to include series and parallel arrays of cells. In 1954, mercury batteries were included in the standard, the 1959 edition identified types suitable for use with transistor radios. In 1967, NEMA took over responsibility for development from the National Bureau of Standards, the 12th edition of C18 began to be harmonized with the IEC standard
3.
American National Standards Institute
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The organization also coordinates U. S. standards with international standards so that American products can be used worldwide. ANSI accredits standards that are developed by representatives of other organizations, government agencies, consumer groups, companies. These standards ensure that the characteristics and performance of products are consistent, that use the same definitions and terms. ANSI also accredits organizations that carry out product or personnel certification in accordance with requirements defined in international standards, the organizations headquarters are in Washington, DC. ANSIs operations office is located in New York City, the ANSI annual operating budget is funded by the sale of publications, membership dues and fees, accreditation services, fee-based programs, and international standards programs. ANSI was originally formed in 1918, when five engineering societies, in 1928, the AESC became the American Standards Association. In 1966, the ASA was reorganized and became United States of America Standards Institute, the present name was adopted in 1969. At the behest of the AIEE, they invited the U. S. government Departments of War, Navy, according to Adam Stanton, the first permanent secretary and head of staff in 1919, AESC started as an ambitious program and little else. Staff for the first year consisted of one executive, Clifford B, lePage, who was on loan from a founding member, ASME. An annual budget of $7,500 was provided by the founding bodies, aNSIs members are government agencies, organizations, corporations, academic and international bodies, and individuals. In total, the Institute represents the interests of more than 125,000 companies and 3.5 million professionals, though ANSI itself does not develop standards, the Institute oversees the development and use of standards by accrediting the procedures of standards developing organizations. ANSI accreditation signifies that the used by standards developing organizations meet the Institutes requirements for openness, balance, consensus. Voluntary consensus standards quicken the market acceptance of products while making clear how to improve the safety of products for the protection of consumers. There are approximately 9,500 American National Standards that carry the ANSI designation, the Institute is the official U. S. S. ANSI participates in almost the entire program of both the ISO and the IEC, and administers many key committees and subgroups. In many instances, U. S. standards are taken forward to ISO and IEC, through ANSI or the USNC, in 2009, ANSI and the National Institute of Standards and Technology formed the Nuclear Energy Standards Coordination Collaborative. NESCC is a joint initiative to identify and respond to the current need for standards in the nuclear industry. The ASA photographic exposure system, originally defined in ASA Z38.2.1 and ASA PH2.5, together with the DIN system, became the basis for the ISO system, a standard for the set of values used to represent characters in digital computers
4.
Electronics
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Electronics is the science of controlling electrical energy electrically, in which the electrons have a fundamental role. Commonly, electronic devices contain circuitry consisting primarily or exclusively of active semiconductors supplemented with passive elements, the science of electronics is also considered to be a branch of physics and electrical engineering. The ability of electronic devices to act as switches makes digital information processing possible, until 1950 this field was called radio technology because its principal application was the design and theory of radio transmitters, receivers, and vacuum tubes. Today, most electronic devices use semiconductor components to perform electron control and this article focuses on engineering aspects of electronics. Components are generally intended to be connected together, usually by being soldered to a circuit board. Components may be packaged singly, or in more complex groups as integrated circuits, some common electronic components are capacitors, inductors, resistors, diodes, transistors, etc. Components are often categorized as active or passive, vacuum tubes were among the earliest electronic components. They were almost solely responsible for the revolution of the first half of the Twentieth Century. They took electronics from parlor tricks and gave us radio, television, phonographs, radar, long distance telephony and they played a leading role in the field of microwave and high power transmission as well as television receivers until the middle of the 1980s. Since that time, solid state devices have all but completely taken over, vacuum tubes are still used in some specialist applications such as high power RF amplifiers, cathode ray tubes, specialist audio equipment, guitar amplifiers and some microwave devices. The 608 contained more than 3,000 germanium transistors, thomas J. Watson Jr. ordered all future IBM products to use transistors in their design. From that time on transistors were almost exclusively used for computer logic, circuits and components can be divided into two groups, analog and digital. A particular device may consist of circuitry that has one or the other or a mix of the two types, most analog electronic appliances, such as radio receivers, are constructed from combinations of a few types of basic circuits. Analog circuits use a range of voltage or current as opposed to discrete levels as in digital circuits. The number of different analog circuits so far devised is huge, especially because a circuit can be defined as anything from a single component, analog circuits are sometimes called linear circuits although many non-linear effects are used in analog circuits such as mixers, modulators, etc. Good examples of analog circuits include vacuum tube and transistor amplifiers, one rarely finds modern circuits that are entirely analog. These days analog circuitry may use digital or even microprocessor techniques to improve performance and this type of circuit is usually called mixed signal rather than analog or digital. Sometimes it may be difficult to differentiate between analog and digital circuits as they have elements of both linear and non-linear operation, an example is the comparator which takes in a continuous range of voltage but only outputs one of two levels as in a digital circuit
5.
Electrochemical cell
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An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or facilitating chemical reactions through the introduction of electrical energy. A common example of a cell is a standard 1. 5-volt cell meant for consumer use. This type of device is known as a galvanic cell. A battery consists of one or more cells, connected in parallel or series pattern. An electrochemical cell consists of two half-cells, each half-cell consists of an electrode and an electrolyte. The two half-cells may use the same electrolyte, or they may use different electrolytes, the chemical reactions in the cell may involve the electrolyte, the electrodes, or an external substance. In a full electrochemical cell, species from one half-cell lose electrons to their electrode while species from the other half-cell gain electrons from their electrode. A salt bridge is employed to provide ionic contact between two half-cells with different electrolytes, yet prevent the solutions from mixing and causing unwanted side reactions. An alternative to a bridge is to allow direct contact between the two half-cells, for example in simple electrolysis of water. As electrons flow from one half-cell to the other through an external circuit, if no ionic contact were provided, this charge difference would quickly prevent the further flow of electrons. A salt bridge allows the flow of negative or positive ions to maintain a charge distribution between the oxidation and reduction vessels, while keeping the contents otherwise separate. Other devices for achieving separation of solutions are porous pots and gelled solutions, a porous pot is used in the Bunsen cell. Each half-cell has a characteristic voltage, various choices of substances for each half-cell give different potential differences. Each reaction is undergoing an equilibrium reaction between different oxidation states of the ions, When equilibrium is reached, the cell cannot provide further voltage. In the half-cell that is undergoing oxidation, the closer the equilibrium lies to the ion/atom with the more positive oxidation state the potential this reaction will provide. Likewise, in the reaction, the closer the equilibrium lies to the ion/atom with the more negative oxidation state the higher the potential. The cell potential can be predicted through the use of electrode potentials and these half-cell potentials are defined relative to the assignment of 0 volts to the standard hydrogen electrode. The difference in voltage between electrode potentials gives a prediction for the potential measured, when calculating the difference in voltage, one must first rewrite the half-cell reaction equations to obtain a balanced oxidation-reduction equation
6.
Voltage
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Voltage, electric potential difference, electric pressure or electric tension is the difference in electric potential energy between two points per unit electric charge. The voltage between two points is equal to the work done per unit of charge against an electric field to move the test charge between two points. This is measured in units of volts, voltage can be caused by static electric fields, by electric current through a magnetic field, by time-varying magnetic fields, or some combination of these three. A voltmeter can be used to measure the voltage between two points in a system, often a reference potential such as the ground of the system is used as one of the points. A voltage may represent either a source of energy or lost, used, given two points in space, x A and x B, voltage is the difference in electric potential between those two points. Electric potential must be distinguished from electric energy by noting that the potential is a per-unit-charge quantity. Like mechanical potential energy, the zero of electric potential can be chosen at any point, so the difference in potential, i. e. the voltage, is the quantity which is physically meaningful. The voltage between point A to point B is equal to the work which would have to be done, per unit charge, against or by the electric field to move the charge from A to B. The voltage between the two ends of a path is the energy required to move a small electric charge along that path. Mathematically this is expressed as the integral of the electric field. In the general case, both an electric field and a dynamic electromagnetic field must be included in determining the voltage between two points. Historically this quantity has also called tension and pressure. Pressure is now obsolete but tension is used, for example within the phrase high tension which is commonly used in thermionic valve based electronics. Voltage is defined so that negatively charged objects are pulled towards higher voltages, therefore, the conventional current in a wire or resistor always flows from higher voltage to lower voltage. Current can flow from lower voltage to higher voltage, but only when a source of energy is present to push it against the electric field. This is the case within any electric power source, for example, inside a battery, chemical reactions provide the energy needed for ion current to flow from the negative to the positive terminal. The electric field is not the only factor determining charge flow in a material, the electric potential of a material is not even a well defined quantity, since it varies on the subatomic scale. A more convenient definition of voltage can be found instead in the concept of Fermi level, in this case the voltage between two bodies is the thermodynamic work required to move a unit of charge between them
7.
Battery terminal
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Battery terminals are the electrical contacts used to connect a load or charger to a single cell or multiple-cell battery. These terminals have a variety of designs, sizes. Automotive batteries typically have one of three types of terminals, the JIS type is similar to the SAE but smaller, once again positive is larger than negative but both are smaller than their SAE counterparts. Most older Japanese cars were fitted with JIS terminals and these side posts are of the same size and do not prevent incorrect polarity connections. L terminals consist of an L-shaped post with a hole through the vertical side. These are used on some European cars, motorcycles, lawn and garden devices, snowmobiles, some batteries sizes are available with terminals in two different configurations, 1) positive on left and negative on right, 2) negative on left and positive on right. Purchasing the wrong configuration may prevent battery cables from reaching the battery terminals, marine batteries typically have two posts, a 3/8-16 threaded post for the positive terminal, and a 5/16-18 threaded post for the negative terminal. Zinc battery terminals are an environmentally friendly alternative to lead battery terminals and these types of battery terminals were designed as a result of environmental directives such as Proposition 65 and ROHS. Zinc battery terminals offer advantages over lead alloy type battery terminals and these advantages include increased electrical conductivity, increased corrosion resistance, and reduces lead removal costs. Batteries designed for use inside a power supply typically use Faston tabs. Larger external battery packs use a variety of connectors, including the Anderson Powerpole MultiPole series, most cylindrical dry batteries have a projection at one end and a flat base. These mate with metal strips or springs in the battery holder, six volt lantern batteries typically feature two coiled, cone-shaped spring terminals, designed to mate with flat contact plates on the inside of the battery compartment. Some lantern batteries instead feature screw terminals, while others instead feature pin holes. Button cell have terminals as both flat sides
8.
Alkaline battery
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Alkaline batteries are a type of primary battery dependent upon the reaction between zinc and manganese dioxide. Another type of batteries are secondary rechargeable alkaline battery, which allows reuse of specially designed cells. Compared with zinc-carbon batteries of the Leclanché or zinc chloride types, alkaline batteries have an energy density and longer shelf-life. The alkaline battery gets its name because it has an electrolyte of potassium hydroxide. Other battery systems also use alkaline electrolytes, but they use different active materials for the electrodes, Alkaline batteries account for 80% of manufactured batteries in the US and over 10 billion individual units produced worldwide. In Japan alkaline batteries account for 46% of all battery sales. In Switzerland alkaline batteries account for 68%, in the UK 60%, Alkaline batteries are used in many household items such as MP3 players, CD players, digital cameras, pagers, toys, lights, and radios, to name a few. Batteries with alkaline electrolyte were first developed by Waldemar Jungner in 1899, on October 9,1957, Urry, Karl Kordesch, and P. A. Marsal filed US patent for the alkaline battery and it was granted in 1960 and was assigned to the Union Carbide Corporation. When introduced in the late 1960s, alkaline batteries contained a small amount of mercury amalgam to control side reactions at the zinc anode. With mercury content reduced by law and improvements in the purity and consistency of materials, in an alkaline battery, the negative electrode is zinc and the positive electrode is manganese dioxide. The alkaline electrolyte of potassium hydroxide is not part of the reaction, only the zinc, the alkaline electrolyte of potassium hydroxide remains, as there are equal amounts of OH− consumed and produced. An alkaline cell can provide three and five times capacity. The capacity of a battery is strongly dependent on the load. An AA-sized alkaline battery might have a capacity of 3000 mAh at low drain, but at a load of 1 ampere, which is common for digital cameras. The voltage of the battery declines steadily during use, so the usable capacity depends on the cut-off voltage of the application. Unlike Leclanche cells, the alkaline cell delivers about as much capacity on intermittent or continuous light loads, on a heavy load, capacity is reduced on continuous discharge compared with intermittent discharge, but the reduction is less than for Leclanche cells. The nominal voltage of an alkaline cell as established by manufacturer standards is 1.5 V
9.
Ampere hour
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The commonly seen milliampere hour is one-thousandth of an ampere hour. The ampere hour is used in measurements of electrochemical systems such as electroplating. A milliampere second is a unit of measure used in X-ray imaging, diagnostic imaging and this quantity is proportional to the total X-ray energy produced by a given X-ray tube operated at a particular voltage. The same total dose can be delivered in different time periods depending on the X-ray tube current, an ampere hour is not a unit of energy. In a battery system, for example, accurate calculation of the energy delivered requires integration of the power delivered over the discharge interval, generally, the battery voltage varies during discharge, an average value or nominal value may be used to approximate the integration of power. The Faraday constant is the charge on one mole of electrons and it is used in electrochemical calculations. An AA size dry cell has a capacity of about 2 to 3 ampere hours, automotive car batteries vary in capacity but a large automobile propelled by an internal combustion engine would have about a 50 ampere hour battery capacity. Since one ampere hour can produce 0.336 grams of aluminium from aluminium chloride
10.
Lithium battery
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Lithium batteries are batteries that have lithium as an anode. These types of batteries are also referred to as lithium-metal batteries and they stand apart from other batteries in their high charge density and high cost per unit. The term lithium battery refers to a family of different lithium-metal chemistries, comprising many types of cathodes and electrolytes, the battery requires from 0.15 to 0.3 kg of lithium per kWh. The most common type of lithium cell used in consumer applications uses metallic lithium as anode and manganese dioxide as cathode, another type of lithium cell having a large energy density is the lithium-thionyl chloride cell. The cell contains a mixture of thionyl chloride and lithium tetrachloroaluminate. A porous carbon material serves as a current collector which receives electrons from the external circuit. Lithium-thionyl chloride batteries are well suited to extremely low-current applications where long life is necessary, the liquid organic electrolyte is a solution of an ion-forming inorganic lithium compound in a mixture of a high-permittivity solvent and a low-viscosity solvent. Lithium batteries find application in many long-life, critical devices, such as pacemakers and these devices use specialized lithium-iodide batteries designed to last 15 or more years. But for other, less critical applications such as in toys, in such cases, an expensive lithium battery may not be cost-effective. Lithium batteries can be used in place of ordinary alkaline cells in many devices, such as clocks, although they are more costly, lithium cells will provide much longer life, thereby minimizing battery replacement. However, attention must be given to the voltage developed by the lithium cells before using them as a drop-in replacement in devices that normally use ordinary zinc cells. Lithium batteries also prove valuable in oceanographic applications, while lithium battery packs are considerably more expensive than standard oceanographic packs, they hold up to three times the capacity of alkaline packs. The high cost of servicing remote oceanographic instrumentation often justifies this higher cost and they are available in many shapes and sizes, with a common variety being the 3 volt coin type manganese variety, typically 20 mm in diameter and 1. 6–4 mm thick. The heavy electrical demands of many of these devices make lithium batteries a particularly attractive option, in particular, lithium batteries can easily support the brief, heavy current demands of devices such as digital cameras, and they maintain a higher voltage for a longer period than alkaline cells. Lithium primary batteries account for 28% of all battery sales in Japan. In the EU only 0. 5% of all battery sales including secondary types are lithium primaries, the computer industrys drive to increase battery capacity can test the limits of sensitive components such as the membrane separator, a polyethylene or polypropylene film that is only 20-25 µm thick. The energy density of lithium batteries has more than doubled since they were introduced in 1991, when the battery is made to contain more material, the separator can undergo stress. Lithium batteries can provide extremely high currents and can discharge very rapidly when short-circuited, although this is useful in applications where high currents are required, a too-rapid discharge of a lithium battery can result in overheating of the battery, rupture, and even explosion
11.
Digital camera
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A digital camera or digicam is a camera that produces digital images that can be stored in a computer, displayed on a screen and printed. Most cameras sold today are digital, and digital cameras are incorporated into many devices ranging from PDAs, Digital and movie cameras share an optical system, typically using a lens with a variable diaphragm to focus light onto an image pickup device. The diaphragm and shutter admit the correct amount of light to the imager, just as with film, however, unlike film cameras, digital cameras can display images on a screen immediately after being recorded, and store and delete images from memory. Many digital cameras can also record moving videos with sound, some digital cameras can crop and stitch pictures and perform other elementary image editing. The history of the camera began with Eugene F. Lally of the Jet Propulsion Laboratory. His 1961 idea was to take pictures of the planets and stars while travelling through space to give information about the astronauts position, unfortunately, as with Texas Instruments employee Willis Adcocks filmless camera in 1972, the technology had yet to catch up with the concept. Steven Sasson as an engineer at Eastman Kodak invented and built the first electronic camera using a charge-coupled device image sensor in 1975, earlier ones used a camera tube, later ones digitized the signal. Early uses were military and scientific, followed by medical. In the mid to late 1990s digital cameras became common among consumers, by the mid-2000s digital cameras had largely replaced film cameras, and higher-end cell phones had an integrated digital camera. By the beginning of the 2010s, almost all smartphones had a digital camera. The two major types of image sensor are CCD and CMOS. A CCD sensor has one amplifier for all the pixels, while each pixel in a CMOS active-pixel sensor has its own amplifier, compared to CCDs, CMOS sensors use less power. Cameras with a small sensor use a back-side-illuminated CMOS sensor, overall final image quality is more dependent on the image processing capability of the camera, than on sensor type. The resolution of a camera is often limited by the image sensor that turns light into that discrete signals. The brighter the image at a point on the sensor. Depending on the structure of the sensor, a color filter array may be used. The number of pixels in the sensor determines the cameras pixel count, in a typical sensor, the pixel count is the product of the number of rows and the number of columns. For example, a 1,000 by 1,000 pixel sensor would have 1,000,000 pixels, final quality of an image depends on all optical transformations in the chain of producing the image
12.
Solar charger
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A solar charger employs solar energy to supply electricity to devices or charge batteries. Solar chargers can charge lead acid or Ni-Cd battery banks up to 48 V, such type of solar charger setups generally use an intelligent charge controller. A series of cells are installed in a stationary location. They can also be used in addition to mains-supply chargers for energy saving during the daytime, most portable chargers can obtain energy from the sun only. Some, including the Kinesis K3, and GeNNex Solar Cell 2 can work either way, examples of solar chargers in popular use include, Small portable models designed to charge a range of different mobile phones, cell phones, iPods or other portable audio equipment. Fold out models designed to sit on the dashboard of an automobile, flashlights/torches, often combined with a secondary means of charging, such as a kinetic charging system. Public solar chargers permanently installed in places, such as parks, squares and streets. Portable solar chargers are used to charge cell phones and other electronic devices on the go. The other type of solar chargers are those with wheels which enable them to be transported from one place to another. They are semi-public, considering the fact that are used publicly, a good example of this kind of portable solar charger is the Strawberry Mini device. The solar charger industry has been plagued by companies mass-producing low efficiency solar chargers that dont meet the consumers expectations and this in turn has made it hard for new solar charger companies to gain the trust of consumers. Solar companies are starting to offer high-efficiency solar chargers, when it comes to permanently installed public solar chargers, Strawberry energy Company from Serbia has invented and developed the first public solar charger for mobile devices, Strawberry Tree. Due to a built in rechargeable battery which stores energy, it can function without sunshine or at night, other companies such as Voltaic Systems, Poweradd and others have started to push better products onto the market as well. Solar power provides an opportunity for rural areas to leapfrog traditional grid infrastructure, some solar chargers also have an on-board battery which is charged by the solar panel when not charging anything else. This allows the user to be able to use the energy stored in the battery to charge their electronic devices at night or when indoors. An example of a charger is by Germany-based company Changers. You can disconnect the battery from the panel and take only the battery with you when it is fully charged. Solar chargers can also be rollable or flexible and are manufactured using thin film PV technology, rollable solar chargers may include Li-ion batteries
13.
Eneloop
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Eneloop is a brand of 1.2 Volt low self-discharge nickel–metal hydride rechargeable batteries and accessories developed by Sanyo, and introduced in 2005. Eneloop cells lose their charge much slower than the 0. 5% to 4% per day lost by older technology NiMH batteries and this allows them to be sold precharged and ready for use, unlike older types. Because they can replace a number of alkaline batteries over their life cycle. Sanyo was acquired by Panasonic in 2009, as part of that deal, the Japanese Eneloop factories were sold off to Fujitsu, which since then produces 2nd-generation eneloops under its brand. Panasonic eneloops, starting with the 3rd generation, are made in China for some markets, as of November 2015, Eneloop Pro remains made in Japan. The original Eneloop batteries were introduced in AA and AAA size and they could be recharged 1,000 times, and held up to 75% of their charge after one year. The part number for this generation of Eneloop is HR-3UTG and HR-4UTG, the second generation of Eneloop AA and AAA batteries was introduced in 2010. It endured 1,500 recharge cycles and held 85% of the charge after one year, Sanyo introduced C- and D-sized Eneloop batteries with a minimum capacity of 2,700 mAh and 3,000 mAh respectively in 2009, along with a new universal charger. As these sizes were available in Japan and Singapore, Sanyo offered adapter sleeves to fit AA batteries in devices that take C or D batteries. In October 2011 the batteries were again improved to retain up to 90% of their capacity after one year, the batteries can be recharged up to 1,800 times, rather than the 1,500 times of the previous revision. The product numbers for these batteries are HR-3UTGB and HR-4UTGB, at the same time, the C- and D-sized Eneloop batteries stated minimum capacities were increased to 3,000 mAh and 5,700 mAh respectively. They were available in Japan from November 2011, european models went on sale from the beginning of October 2012. Following the acquisition of Sanyo by Panasonic, a generation was introduced in April 2013. The number of charges per cell was increased from 1800 to 2100 cycles for both AA and AAA models, in some countries the batteries are branded as Panasonic. The Eneloop Lite line was released in Japan in June 2010 and they addressed two downsides of alkaline and other NiMH batteries, the initial cost and the long charging time—both achieved by reducing the capacity of the battery. The batteries find suitable applications in devices such as remote control devices and alarms. The AAs have 1,000 mAh of capacity, while the AAAs have 600 mAh, due to reduction of the capacity compared to the regular Eneloop cells, the charging time is halved for the AA and reduced by 25% for the AAA. On the other hand, they can be recharged 3,000 times, the reduction in capacity also reduced the production cost, which decreased the initial investment for rechargeable batteries and they weigh 30% less
14.
Rechargeable battery
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It is composed of one or more electrochemical cells. The term accumulator is used as it accumulates and stores energy through an electrochemical reaction. Rechargeable batteries are produced in different shapes and sizes, ranging from button cells to megawatt systems connected to stabilize an electrical distribution network. Several different combinations of materials and electrolytes are used, including lead–acid, nickel cadmium, nickel metal hydride, lithium ion. Some rechargeable battery types are available in the sizes and voltages as disposable types. Devices which use rechargeable batteries include automobile starters, portable devices, light vehicles, tools, uninterruptible power supplies. Emerging applications in hybrid internal combustion-battery and electric vehicles drive the technology to reduce cost, weight, and size, Battery storage power stations use rechargeable batteries for load-leveling and for renewable energy uses. Load-leveling reduces the power which a plant must be able to generate, reducing capital cost. The US National Electrical Manufacturers Association estimated in 2006 that US demand for batteries was growing twice as fast as demand for disposables. Small rechargeable batteries can power portable devices, power tools, appliances. Heavy-duty batteries power electric vehicles, ranging from scooters to locomotives and they are used in distributed electricity generation and in stand-alone power systems. During charging, the active material is oxidized, producing electrons. These electrons constitute the current flow in the external circuit, the energy used to charge rechargeable batteries usually comes from a battery charger using AC mains electricity, although some are equipped to use a vehicles 12-volt DC power outlet. Regardless, to energy in a secondary cell, it has to be connected to a DC voltage source. The negative terminal of the cell has to be connected to the terminal of the voltage source. Chargers take from a few minutes to several hours to charge a battery, slow dumb chargers without voltage or temperature-sensing capabilities will charge at a low rate, typically taking 14 hours or more to reach a full charge. Rapid chargers can typically charge cells in two to five hours, depending on the model, with the fastest taking as little as fifteen minutes, fast chargers must have multiple ways of detecting when a cell reaches full charge to stop charging before harmful overcharging or overheating occurs. The fastest chargers often incorporate cooling fans to keep the cells from overheating, Battery charging and discharging rates are often discussed by referencing a C rate of current
15.
Lithium-ion battery
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A lithium-ion battery or Li-ion battery is a type of rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and back when charging. Li-ion batteries use an intercalated lithium compound as one electrode material, the electrolyte, which allows for ionic movement, and the two electrodes are the constituent components of a lithium-ion battery cell. Lithium-ion batteries are common in home electronics and they are one of the most popular types of rechargeable batteries for portable electronics, with a high energy density, tiny memory effect and low self-discharge. Beyond consumer electronics, LIBs are also growing in popularity for military, battery electric vehicle, for example, lithium-ion batteries are becoming a common replacement for the lead–acid batteries that have been used historically for golf carts and utility vehicles. Chemistry, performance, cost and safety characteristics vary across LIB types, handheld electronics mostly use LIBs based on lithium cobalt oxide, which offers high energy density, but presents safety risks, especially when damaged. Lithium iron phosphate, lithium ion manganese oxide battery and lithium nickel manganese cobalt oxide offer lower energy density, such batteries are widely used for electric tools, medical equipment and other roles. NMC in particular is a contender for automotive applications. Lithium nickel cobalt aluminum oxide and lithium titanate are specialty designs aimed at particular niche roles, the newer lithium–sulfur batteries promise the highest performance-to-weight ratio. Lithium-ion batteries can pose unique safety hazards since they contain a flammable electrolyte, an expert notes If a battery cell is charged too quickly, it can cause a short circuit, leading to explosions and fires. Because of these risks, testing standards are more stringent than those for acid-electrolyte batteries, there have been battery-related recalls by some companies, including the 2016 Samsung Note 7 recall for battery fires. This article covers just the topics and general principles of lithium-ion batteries. Nearly all facets have elements that are impacted by currently very active development or research, a cell is a basic electrochemical unit that contains the basic components, such as electrodes, separator, and electrolyte. In the case of cells, this is the single cylindrical, prismatic or pouch unit. In this regard, the simplest battery is a cell with perhaps a small electronic circuit for protection. In many cases, distinguishing between cell and battery is not important, however, this should be done when dealing with specific applications, for example, battery electric vehicles, where battery may indicate a high voltage system of 400 V, and not a single cell. The term module is used as an intermediate topology, with the understanding that a battery pack is made of modules. In electrochemistry, the anode is the electrode where oxidation is taking place in the battery, i. e. electrons get free, however, this happens on opposite electrodes during charge vs. discharge. Historically, for lithium cells, which started as single use discharge cells and this is true on discharge, but with a rechargeable system, the negative electrode chemically becomes the cathode while charging
16.
Rechargeable alkaline battery
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A rechargeable alkaline battery is a type of alkaline battery that is capable of recharging for repeated use. The first-generation rechargeable alkaline technology was developed by Battery Technologies Inc in Canada and licensed to Pure Energy, EnviroCell, Rayovac, subsequent patent and advancements in technology have been introduced. The formats include AAA, AA, C, D, rechargeable alkaline batteries are manufactured fully charged and have the ability to hold their charge for years, longer than NiCd and NiMH batteries, which self-discharge. Rechargeable alkaline batteries can have a high recharging efficiency and have environmental impact than disposable cells. Most alkaline batteries available are disposable, designed to be used until exhausted, there are also rechargeable alkaline batteries, designed to be recharged. Disposable alkaline batteries are classed as primary batteries, manufacturers do not support recharging, despite this advice, alkaline batteries have successfully been recharged, and suitable chargers have been available. The capacity of an alkaline battery declines with number of recharges. Low-ripple direct current is not suitable for charging disposable alkaline batteries, more suitable is a current pulsed at a rate of 40 to 200 pulses per second, pulsed charging appears to reduce the risk of electrolyte—usually potassium hydroxide —leakage. The charging current is low to prevent rapid production of gases that can rupture the cell, cells that have leaked electrolyte are a safety hazard and unsuitable for reuse. Attempting to recharge a discharged alkaline battery can cause the production of gas within the canister, as the canister is normally sealed, pressure generated by rapid accumulation of gas can open the pressure relief seal and cause leakage of electrolyte. Potassium hydroxide in the electrolyte is corrosive and may cause injury and damage, some materials used in batteries are damaging to the environment. In some jurisdictions it is illegal to dispose of batteries in ordinary waste streams, free collection points for used portable batteries are often available where batteries are sold. As an alkaline battery is discharged, chemicals inside the battery react to create an electric current, however, once the chemicals have reached chemical equilibrium, the reaction stops, and the battery is depleted. By driving a current through the battery in the reverse direction, different batteries rely on different chemical reactions. Some reactions are reversible, some are not. The reactions used in most alkaline batteries fall into the latter category, although these batteries can be used in any device that supports a standard size, they are formulated to last longest in periodical use items. If they are discharged by less than 25%, they can be recharged for hundreds of cycles to about 1.42 V, if they are discharged by less than 50%, they can be almost fully recharged for a few dozen cycles, to about 1.32 V. After a deep discharge, they can be brought to their original high-capacity charge only after a few charge-discharge cycles, the rechargeable alkaline battery is cheaper than other rechargeable types
17.
Kilowatt hour
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The kilowatt-hour is a derived unit of energy equal to 3.6 megajoules. If the energy is being transmitted or used at a constant rate over a period of time, the kilowatt-hour is commonly used as a billing unit for energy delivered to consumers by electric utilities. The kilowatt-hour is a unit of energy equivalent to one kilowatt of power sustained for one hour. 1 k W ⋅ h = =3600 =3600 k J =3.6 M J One watt is equal to 1 J/s. One kilowatt-hour is 3.6 megajoules, which is the amount of energy converted if work is done at a rate of one thousand watts for one hour. The base unit of energy within the International System of Units is the joule, the hour is a unit of time outside the SI, making the kilowatt-hour a non-SI unit of energy. The kilowatt-hour is not listed among the non-SI units accepted by the BIPM for use with the SI, although the hour, an electric heater rated at 1000 watts, operating for one hour uses one kilowatt-hour of energy. A television rated at 100 watts operating for 10 hours continuously uses one kilowatt-hour, a 40-watt light bulb operating continuously for 25 hours uses one kilowatt-hour. Electrical energy is sold in kilowatt-hours, cost of running equipment is the product of power in kilowatts multiplied by running time in hours, the unit price of electricity may depend upon the rate of consumption and the time of day. Industrial users may also have extra charges according to their peak usage, the symbol kWh is commonly used in commercial, educational, scientific and media publications, and is the usual practice in electrical power engineering. Other abbreviations and symbols may be encountered, kW h is less commonly used and it is consistent with SI standards. This is supported by a standard issued jointly by an international and national organization. However, at least one major usage guide and the IEEE/ASTM standard allow kWh, One guide published by NIST specifically recommends avoiding kWh to avoid possible confusion. KW·h is, like kW h, preferred with SI standards, the US official fuel-economy window sticker for electric vehicles uses the abbreviation kW-hrs. Variations in capitalization are sometimes seen, KWh, KWH, kwh, the notation kW/h, as a symbol for kilowatt-hour, is not correct. To convert a quantity measured in a unit in the column to the units in the top row, multiply by the factor in the cell where the row. All the SI prefixes are commonly applied to the watt-hour, a kilowatt-hour is 1,000 W·h (symbols kW·h, kWh or kW h, a megawatt-hour is 1 million W·h, a milliwatt-hour is 1/1000 W·h and so on. Megawatt-hours, gigawatt-hours, and terawatt-hours are often used for metering larger amounts of energy to industrial customers
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Eveready Battery Company
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Eveready Battery Company, Inc. is an American manufacturer of battery brands. Eveready and Energizer, owned by Energizer Holdings and its headquarters are in St. Louis, Missouri. On January 10,1899, American Electrical Novelty and Manufacturing Company obtained U. S, patent No.617,592 from David Misell, an inventor. This electric device designed by Misell was powered by D batteries laid front-to-back in a tube with the light bulb. Misell, the inventor of the tubular hand-held electric device, assigned his invention over to the American Electrical Novelty, in 1905, Hubert changed the name again to The American Ever Ready Company, selling flashlights and batteries under the trademark Ever Ready. In 1906 the British Ever Ready Electrical Company was formed for export of batteries, in 1914, The American Ever Ready Company became part of National Carbon Company. Hubert stayed on as the president, the trademark was shortened to Eveready. In 1917, National Carbon Company merged with Union Carbide to form The Union Carbide, from 1917 until 1921, Eveready used the trademark DAYLO for their flashlights and on their batteries. In 1957, employees Lewis Urry, Paul Marsal and Karl Kordesch invented a long-lasting alkaline battery using a zinc/manganese dioxide chemistry while working for Union Carbides Cleveland plant, the company did not aggressively market the invention, however, and instead continued to market the old Zinc-carbon battery. As a result, the company lost significant market share to Duracell, prior to March 1,1980, the companys alkaline battery had been called the Eveready Alkaline Battery, Eveready Alkaline Energizer and Eveready Alkaline Power Cell. On March 1,1980, it was rebadged under its current name, in 1986, Union Carbide sold its Battery Products Division to Ralston Purina Company for $US1.4 billion, becoming the Eveready Battery Company, Inc. a wholly owned subsidiary. At that time, the Eveready and Energizer batteries held 52 percent market share, the company under Ralston lost market share to rival Duracell. In 1992, it bought the British Ever Ready Electrical Company from Hanson Trust, in 1999, Eveready sold its rechargeable battery division, although it still markets them for retail sale. The majority of batteries are made in China, there are also numerous production facilities outside the US. In the 1920s, the company sponsored The Eveready Hour on radio, in 1941 after the United States entered World War II, the slogan changed to Change your batteries, get a nickel. to encourage economic growth. In the early 1980s, it utilized the slogan, Energized, showing people using Energizers in everyday situations. In 1986, the company highlighted an advertising campaign best known for Mary Lou Retton averring, in the late 1980s, there was an advertising campaign featuring Mark Jacko Jackson and his pitch line Energizer. Since 1988, the well-known Energizer Bunny has been featured in its television ads, the bunny was based on the similar Duracell Bunny used in the UK
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Battery (electricity)
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An electric battery is a device consisting of one or more electrochemical cells with external connections provided to power electrical devices such as flashlights, smartphones, and electric cars. When a battery is supplying power, its positive terminal is the cathode. The terminal marked negative is the source of electrons that when connected to a circuit will flow. It is the movement of ions within the battery which allows current to flow out of the battery to perform work. Historically the term specifically referred to a device composed of multiple cells. Primary batteries are used once and discarded, the materials are irreversibly changed during discharge. Common examples are the battery used for flashlights and a multitude of portable electronic devices. Secondary batteries can be discharged and recharged multiple times using mains power from a wall socket, examples include the lead-acid batteries used in vehicles and lithium-ion batteries used for portable electronics such as laptops and smartphones. According to a 2005 estimate, the battery industry generates US$48 billion in sales each year. Batteries have much lower energy than common fuels such as gasoline. This is somewhat offset by the efficiency of electric motors in producing mechanical work. The usage of battery to describe a group of electrical devices dates to Benjamin Franklin, alessandro Volta built and described the first electrochemical battery, the voltaic pile, in 1800. This was a stack of copper and zinc plates, separated by brine-soaked paper disks, Volta did not understand that the voltage was due to chemical reactions. Although early batteries were of value for experimental purposes, in practice their voltages fluctuated. It consisted of a pot filled with a copper sulfate solution, in which was immersed an unglazed earthenware container filled with sulfuric acid. These wet cells used liquid electrolytes, which were prone to leakage and spillage if not handled correctly, many used glass jars to hold their components, which made them fragile and potentially dangerous. These characteristics made wet cells unsuitable for portable appliances, near the end of the nineteenth century, the invention of dry cell batteries, which replaced the liquid electrolyte with a paste, made portable electrical devices practical. Batteries convert chemical energy directly to electrical energy, a battery consists of some number of voltaic cells
20.
AAAA battery
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The AAAA battery is 42.5 mm long and 8.3 mm in diameter. The alkaline cell weighs around 6.5 g and produces 1.5 V and this size battery is also classified as R8D425 and 25. The alkaline battery in this size is known by Duracell type number MN2500 or MX2500. This battery size is most often used in devices such as laser pointers, LED penlights, powered computer styluses, glucose meters. These batteries are not as popular as AAA or AA type batteries, some models of alkaline nine-volt battery may consist of a bundle of six LR61 cells inside, connected together by welded tabs. These cells are similar to AAAA cells and can be used in their place in some devices. These cells are often unmarked so special care must be taken with polarity, Battery nomenclature Battery Battery recycling Brand Neutral Drawing Of AAAA Alkaline battery based on ANSI Specifications
21.
AAA battery
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An AAA or triple-A battery is a standard size of dry cell battery commonly used in low-drain portable electronic devices. A triple-A battery is a cell and measures 10.5 mm in diameter and 44.5 mm in length, including the positive terminal button. The positive terminal has a diameter of 3.8 mm. Alkaline AAA batteries weigh around 11.5 grams, while primary lithium AAA batteries weigh about 7.6 g, rechargeable nickel–metal hydride AAA batteries typically weigh 14–15 g. AAA batteries are most often used in electronic devices, such as TV remote controls, MP3 players. Devices that require the same voltage, but have a current draw, are often designed to use larger batteries such as the AA battery type. AA batteries have about three times the capacity of AAA batteries, with the increasing efficiency and miniaturization of modern electronics, many devices which previously were designed for AA batteries are being replaced by models that accept AAA Battery cells. As of 2007, AAA batteries accounted for 24% of alkaline battery sales in the United States. In Japan as of 2011, 28% of alkaline batteries sold were AAA. In Switzerland as of 2008, AAA batteries totaled 30% of primary battery sales and 32% of secondary battery sales
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C battery
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The C battery is a standard size of cell typically used in medium-drain applications such as toys and musical instruments. As of 2007, C batteries accounted for 4% of alkaline battery sales in the United States. In Switzerland as of 2008, C batteries totalled 5. 4% of primary battery sales and 3. 4% of secondary battery sales, a C battery measures 50 millimetres length and 26.2 millimetres diameter. The voltage and capacity of a C-size battery depends on the battery chemistry, Alkaline C batteries can hold up to 8,000 mAh, rechargeable NiMH C batteries can hold up to 6,000 mAh, and zinc-carbon C batteries usually hold up to 3,800 mAh. Like the D battery, the C battery size has been standardized since the 1920s, the AA, AAA, and N sizes have been in common use since the 1950s. The C battery is called 14 in current ANSI standards of battery nomenclature, archived from the original on 8 June 2012. Duracell Overview Of Primary Alkaline Manganese Dioxide Systems Energizer C Size Battery Specification for Alkaline Cell
23.
D battery
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A D battery is a size of dry cell. A D cell is cylindrical with a contact at each end. A D cell may be either rechargeable or non-rechargeable and its terminal voltage and capacity depend upon its cell chemistry. The National Carbon Company introduced the first D cell in 1898, before smaller cells became more common, D cells were widely known as flashlight batteries. The U. S. military designation for this battery has been BA-30 since sometime before World War II, during World War II it was designated the Type C battery by the Navy leading to confusion with the smaller C cell battery. In 2007, D batteries accounted for 8% of alkaline battery sales in the US. In 2008, Swiss purchases of D batteries amounted to 3. 4% of primary and 1. 4% of secondary sales, a batterys capacity depends upon its cell chemistry and current draw. Energizer brand rates its alkaline D cell at approximately 20, 000mAh at 25mA draw and this effect is generally less pronounced in cells with NiCd and NiMH chemistries, see Peukerts law. Many commonly available size D rechargeable cells are actually sub-C cells in a D-sized holder, D batteries have, Nominal diameter of 33.2 ±1 millimeters
24.
N battery
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An N battery is a standard size of dry cell battery. An N battery is cylindrical with electrical contacts on each end, the battery has a length of 30.2 mm and a diameter of 12.0 mm, and is approximately three-fifths the length of a AA battery. A zinc-carbon battery in this type is designated as R1 by IEC standards, likewise, ANSI designates this battery as 910A and 910D for alkaline and zinc-carbon chemistries, respectively. Mercury batteries of the dimensions are no longer manufactured because of their toxicity. Former mercury cells such as the Mallory RM401, Duracell RM-401, IEC-MR1, rechargeable N-size batteries are also available, in nickel-cadmium and nickel-metal hydride chemistries. However, these are far less common than other rechargeable sizes, rechargeable N-Series batteries may be charged in a AA charger using a makeshift adapter. Some universal battery chargers are also able to charge N size batteries, an N-cell battery has a similar size to the A23 battery, which has a 12 V output. Battery recycling Brand-neutral drawing of alkaline N battery based on ANSI specifications
25.
Nine-volt battery
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The nine-volt battery, or 9-volt battery, in its most common form was introduced for the early transistor radios. It has a rectangular shape with rounded edges and a polarized snap connector at the top. This type is used in walkie talkies, clocks and smoke detectors. Mercury-oxide batteries of this format, once common, have not been manufactured in many due to their mercury content. Designations for this format include NEDA1604 and IEC 6F22 or MN1604 6LR61, the size, regardless of chemistry, is commonly designated PP3 - a designation originally reserved solely for carbon-zinc - or in some countries, E or E-block. Most nine-volt alkaline batteries are constructed of six individual 1. 5V LR61 cells enclosed in a wrapper and these cells are slightly smaller than LR8D425 AAAA cells and can be used in their place for some devices, even though they are 3.5 mm shorter. Carbon-zinc types are made with six cells in a stack. Primary lithium types are made with 3 cells in series, in 2007, 9-volt batteries accounted for 4% of alkaline primary battery sales in the US. In Switzerland in 2008, 9-volt batteries totalled 2% of primary battery sales, other nine-volt batteries of different sizes exist, such as the British Ever Ready PP series and certain lantern batteries. The battery has both terminals in a connector on one end. The smaller circular terminal is positive, and the hexagonal or octagonal terminal is the negative contact. The connectors on the battery are the same as on the connector itself, the same snap-style connector is used on other battery types in the Power Pack series. Battery polarization is normally obvious since mechanical connection is only possible in one configuration. A problem with this style of connector is that it is easy to connect two batteries together in a short circuit, which quickly discharges both batteries, generating heat and possibly a fire. Because of this hazard, 9-volt batteries should be kept in the original packaging until they are going to be used, an advantage is that several nine-volt batteries can be connected to each other in series to provide higher voltages. Early transistorized radios and other equipment needed a suitable miniature battery. Early transistor radios required a 22 1⁄2 volt battery, fortunately a suitable miniature battery was already marketed for hearing aids. The PP3 appeared when portable transistorised radio receivers became common, and is called a transistor battery by some manufacturers
26.
Lantern battery
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A lantern battery is a rectangular battery, typically an alkaline or zinc-carbon primary battery, used primarily in flashlights or lanterns. Lantern batteries are physically larger and consequently offer higher capacity than the more common torch batteries, lantern batteries comprise multiple cells inside a housing. The most common variant in the US is the 6 volt square-base battery with spring terminals, in Europe the most common is the 4.5 volt flat-pack types. The 6-volt variety typically has spring or screw terminals, different types have different internal construction, the same package size may be made up with D size or F size cells, giving different capacity. A rechargeable version, comprising a three-cell sealed lead-acid battery with a lower capacity than primary versions, has also been marketed and they are also used in the construction industry for powering flashing lights at roadworks. More common in Europe and Russian Federation, this is a smaller and it uses two metal strips as terminals. The shorter strip is the + terminal, the 7. 5-volt version has screw terminals and rectangular base. A carrying handle is connected between the terminals. The 12-volt version has screw terminals and a rectangular base, since it is 12-volt, this type can be used to power car accessories outside of an automobile, using extra wiring or an adapter
27.
A23 battery
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An A23 battery is cylindrical, smaller than a AAA battery, measuring 28.5 mm long and 10.3 mm in diameter, with a typical weight of 8 grams. An A23 battery is an 8-cell device with a voltage of 12 V. The higher voltage is necessary for the radio frequency-transmitting and receiving devices which A23 batteries often power and it has a capacity of around 55 mAh. A23 batteries are constructed of 8 individual LR932 alkaline button cells enclosed in a wrapper, the A23 battery is close in size to the N battery, which has a voltage of 1.25 V to 1.5 V. List of battery sizes Battery Energizer A23 datasheet MN21 datasheet from Duracell Brand neutral drawing of A23 battery
28.
CR-V3 battery
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A CR-V3 battery is a type of disposable high-capacity 3-Volt battery used in various electronic appliances, including some digital cameras. It has the shape and size of two side-by-side AA batteries and this allows CR-V3 batteries to function in many devices originally designed for only AA batteries. An RCR-V3 battery is a rechargeable 3.7 V lithium-ion battery, often, a CR-V3 battery is a single cell based on a non-rechargeable lithium battery chemistry, with a nominal voltage of 3 V. Some more recent CR-V3 batteries are composed of 2 lithium AA batteries, rechargeable lithium-ion RCR-V3 batteries, with a nominal voltage of 3.7 V, are also available. Some have a smaller terminal used for charging and may not be compatible with chargers from different manufacturers
29.
Button cell
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A watch battery or button cell is a small single cell battery shaped as a squat cylinder typically 5 to 25 mm in diameter and 1 to 6 mm high—like a button on a garment, hence the name. A metal can forms the body and positive terminal of the cell. The insulated top cap is the negative terminal, wider variants are usually called coin cells. Devices using button cells are designed to use a cell giving a long service life. Most button cells have low self-discharge and hold their charge for a time if not used. Button cells are cells, usually disposable primary cells. Common anode materials are zinc or lithium, common cathode materials are manganese dioxide, silver oxide, carbon monofluoride, cupric oxide or oxygen from the air. Mercuric oxide button cells were formerly common, but are no longer due to the toxicity. Cells of different chemical composition made in the size are mechanically interchangeable. However, the composition can affect life and voltage stability. Using the wrong cell may lead to life or improper operation. Button cells are very dangerous for small children, Button cells that are swallowed can cause severe internal burns and significant injury or death. Alkaline batteries are made in the same sizes as the other types. They are often sold as cheap watch batteries, and by people who do not know the difference, silver cells may have very stable output voltage until it suddenly drops very rapidly at end of life. Mercury batteries also supply a stable voltage, but are now banned in countries due to their toxicity. Zinc-air batteries use air as the depolarizer and have higher capacity than other types. Cell have seals against air which must be removed before use, cells will then self-discharge in a few weeks, regardless of use. If some device seems to eat up batteries after the original supplied by the manufacturer is replaced, it may be useful to check the devices requirements, discussions on web forums suggest that they can be very poor
