AA battery
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The AA battery is a standard size single cell cylindrical dry battery. The IEC 60086 system calls the size R6, and ANSI C18 calls it 15. It is named UM-3 by JIS of Japan. Historically, it is known as D14, U12 – later U7, or HP7 in official documentation in the United Kingdom, or a pen cell.
AA cells
D, C, AA, AAA, AAAA cells, and a 9-volt battery
Panasonic Eneloop 1.2 volt NiMH rechargeable cells in AA and AAA
Eveready Battery Company
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Eveready Battery Company, Inc. is an American manufacturer of electric battery brands Eveready and Energizer, owned by Energizer Holdings. Its headquarters are located in St. Louis, Missouri.
January 1899 Ever-Ready flashlight ad mentioning the proceedings against the alleged patent-infringing rival companies
1899 Eveready flashlight
"9 Lives" logo
Eveready #742 1½ volt "A" battery with Fahnestock clip terminals for vacuum tube radios (1920s logo)