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An AA battery—also called a ''double A'' or Mignon (French for "dainty") battery—is a standard size single cell cylindrical dry battery. The IEC system calls it size R6, and ANSI calls it size 15.〔(Classic (LR6) ) datasheet from energizer.com〕 AA batteries are common in portable electronic devices. An AA battery is composed of a single electrochemical cell that may be either a primary battery (disposable) or a rechargeable battery. The exact terminal voltage and capacity of an AA size battery depends on cell chemistry. AA batteries account for over 50% of general battery sales. Introduced in 1907,〔http://www.eveready.com/about-us/Pages/about-eveready.aspx〕 the AA battery size was standardized by the American National Standards Institute (ANSI) in 1947, but it had been used in flashlights and electrical novelties for some time before formal standardization. ANSI and IEC Battery nomenclature gives several designations for cells in this size, depending on cell features and chemistry. == Dimensions == An AA cell measures in length, including the button terminal—and in diameter. The positive terminal button should be a minimum 1 mm high and a maximum 5.5 mm in diameter, the flat negative terminal should be a minimum diameter of 7 mm.〔 Alkaline AA cells have a weight of roughly , lithium AA cells have a mass around , and rechargeable NiMH cells around . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AA battery」の詳細全文を読む スポンサード リンク
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