A common size of battery used in many household electric devices and toys. An AA battery is a cylinder, roughly 2 inches in length (5 cm), and 1/3 inch in diameter. One end has the positive terminal, the other the negative. The positive end is distinguished by a small nub.

They are rated at 1.5 volts, and have varying lifetimes depending on the manufacturer and the insides of the battery. Some newer models come built-in with a charge tester.

It has been noted elsewhere that a AA battery is technically not a battery, but a dry cell. But for all practical purposes, they're called batteries. Can't fight English, I suppose.

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