What does "AA" stand for on a battery?

IcrPortugal

The letters on a battery give the size, in height and width, of the battery. AA means “50.5mm x 14.5mm.” http://archives.stupidquestion.net/sq11499batteries.html Dec 04 08, 7:04 PM

Arpeggionist

The system of classifying batteries by size in letters is one going back at least to the 1960s. Originally there were four sizes - A through D - in ascending order. In the 1980s smaller batteries started to become easier to make and less expensive to buy, and when sizes smaller than A required classification, AAs were invented, followed by the AAA. I should note that this is all from memory; I wouldn't know where to look for a source reference site on the matter. Dec 04 08, 7:28 PM