TIL that quadruple A batteries exist
What device even uses this??
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There are six of these in some 9V piles
Which was the secret knowledge for those of us with pen lights or active stylii back in the day that required AAAA cells. And then you'd find a cheap brand of 9v that actually had a stack of nonstandard square cells inside it instead... Bastards.
Certain lantern batteries are filled with AAs as well