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An AA battery also called "double A" or Mignon battery refers to IEC-LR6 battery. It is one of the standard sizes of batteries. Batteries of this size are most commonly used in portable electronic devices. An AA battery is composed of a single electrochemical cell. The exact terminal voltage and capacity of an AA size battery depends on the cell chemistry. AA batteries account for over 50% of general battery sales.
The AA battery size was standardized by the American National Standards Institute in 1947, but had been used in flashlights and electrical novelties for some time before formal standardization. Battery nomenclature gives different designations depending on cell size and chemistry. For example, a zinc–carbon (Leclanché) AA cell is designated "15" by ANSI, and R6 in the IEC system.
Chemistry and capacity 
Primary cells 
Primary (non-rechargeable) zinc–carbon (dry cell) AA batteries have around 400–900 milliamp-hours capacity, with measured capacity highly dependent on test conditions, duty cycle, and cut-off voltage. Zinc–carbon batteries are usually marketed as "general purpose" batteries. Zinc-chloride batteries store around 1000 to 1500 mAh are often sold as "heavy duty" or "super heavy duty". Alkaline batteries from 1700 mAh to 3000 mAh cost a little more than zinc-chloride batteries, but last proportionally longer.
Non-rechargeable lithium batteries are manufactured for devices that drain a large amount of power such as digital cameras, where their high cost is offset by longer running time between battery changes and more constant voltage during discharge.
Rechargeable cells 
Rechargeable batteries in the AA size are available in multiple chemistries. Nickel–cadmium (NiCd) with a capacity of 500–1100 mAh, Nickel–metal hydride (NiMH) in various capacities of 1300–2700 mAh and lithium ion. Lithium ion chemistry has a nominal voltage of 3.6 volts. They are referred to as 14500 li-ion batteries.
|Capacity under 500mA constant drain||400-1700 mAh||1800-2600 mAh||2700-3400 mAh||600– 1000 mAh||800–2850 mAh||1500-1800 mAh|
|Nominal voltage||1.5 V||1.5 V||1.5 V||1.2 V||1.2 V||1.65 V|
In 2011, AA batteries accounted for approximately 60% of alkaline battery sales in the United States. In Japan, 58% of alkaline batteries sold were AA. In Switzerland, AA batteries totaled 55% in both primary and secondary (rechargeable) battery sales.
See also 
-  INOBAT 2008 statistics.
- Life Cycle Impacts of Alkaline Batteries with a Focus on End-of-Life - EPBA-EU
- Monthly battery sales statistics - MoETI - March 2011
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