All about AA batteries
AA batteries are dry cell-type battery commonly used in portable electronic devices. An AA battery measures 51 mm in length, 13.5–14.5 mm in diameter. Traditional alkaline AA batteries have mass of roughly 23 g, lithium AA batteries have mass around 15 g, and rechargeable NiMH batteries have mass about 31 g.
The AA battery type was standardized by ANSI in 1947, and is designated E91 by DIN and AM3 by JIS. In China it is known as the #5 battery. In Germany it is known colloquially as Mignon. An AA battery is composed of a single electrochemical cell. The capacity of rechargeable AA batteries varies with the technology used. AA rechargeable batteries supply 1.2 V; since this is lower than the voltage of standard non-rechargeable cells, there are problems powering some devices with these batteries.
The formerly common zinc-carbon or zinc-chloride AA battery consists of a graphite rod in the center forming an electrode, an anode/electrolyte mix consisting mainly of manganese oxide, a zinc outer shell which serves as the cathode, and a paper, plastic or steel cover. AA lithium’s have a relatively low internal resistance that effectively provides unlimited maximum current that will flow when they encounter a low or zero resistance load. Some equipment is poorly designed such that they pose a low resistance load and rely on a battery’s resistance to limit current.
The simple lithium AA batteries will allow very high current flow and such equipment will not tolerate the higher current.
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