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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.
I can't remember who did it, but there's a YouTuber who always clearifies his phones when he gets a new one by removing the back and putting a gorilla glass back on it. Haven't seen his videos in a while, I don't think, but he has several iirc.
I think "Phone Repair Guru" (or something like that) does it similarly.