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Originally Posted by Raekwon
But what about AAAA what the heck is up with that?
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They're smaller than AAAs.
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and is there just an A battery?
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Yes, there is! It's bigger than a AA, but not as big as a B.
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And how come 9V aren't called square because you can get the large batteries that are also 9V, and don't get me started on "watch" batteries.
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The one we commonly call "9-volt battery" is far and away the most popular size in that voltage, so the 9 V capacity itself has become synonymous with that size. There are lots of other 9 V sizes, but they are basically defunct now.
(And a "9-volt" is the shape it is because it contains six AAAA cells wired in series.)
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