AA battery

The AA battery (or double-A battery) is a standard-size of cylindrical dry battery. They are one of the most common types of interchangeable batteries 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. In the most common standard battery sizes, AA sits between the smaller AAA battery and the larger C battery.

Several different chemistries are used in their construction, most commonly alkaline, zinc–carbon, lithium iron disulfide, and nickel–metal hydride. The exact terminal voltage, capacity and practical discharge rates depend on cell chemistry; however, devices designed for AA cells will usually only take 1.2–1.5 V, unless specified by the manufacturer.