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This 9v battery contained six cells stacked like a layer cake
(lemmy.sdf.org)
This is for strictly mildly interesting material. If it's too interesting, it doesn't belong. If it's not interesting, it doesn't belong.
This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
Just post some stuff and don't spam.
Better use of space - they used to be just six coin cells with a load of empty space for a wire to connect the top connector to bottom of the stack