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.