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This 9v battery contained six cells stacked like a layer cake
(lemmy.sdf.org)
Picture of a disassembled Duracell 9v battery. Below the terminal assembly is a clear plastic case where you can see six sets of stacked rectangular terminals and fillings.
Who needs protection when you have cool lookin batteries?
Jokes aside, maybe a print of how the insides look would be cool, too. Like the phone cases from that recent JerryRigs drama.