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| AA batteries. © Eugene Brennan |
Ray Darcy was going on about random stuff as usual today and we heard some trivia about quadruple-A or "AAAA" batteries. These are a bit shorter and narrower than an "AAA" cell, and used for slim devices like styluses, laser pointers, penlights and glucose meters. There was also a single-A cell that is now obsolete and also a newer "A" cell and fractional "AA" cells.
This comprehensive Wikipedia article lists all the various battery sizes, both still used and obsolete.