Sinclair President
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The Sinclair President is a calculator released by Sinclair Radionics in early 1978. There were two models, the President and the President Scientific. They were among the last calculators produced by
A Sinclair President calculator (on a grid of 5cm squares)
AA battery
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The AA battery is a standard-size of cylindrical dry battery. They are one of the most common types of interchangable batteries in portable electronic devices. An AA battery is composed of a single el
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