Teardown: Energizer A23 12v “Car Alarm Remote” Battery

Last week, one of the batteries in a car alarm remote key fob needed replacing, so I managed to get the old expired battery before it hit the bin. I thought I’d take it apart and document it, having done it before in the past. If you’ve ever taken apart a 9v cell and found 6xAAAA cells inside – you’ll like this.

It’s an Energizer A23 12v battery, quite common amongst older car security remotes.

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The seam at the back is very easy to pry open – all you need is a half-decent flat-bladed screwdriver and it just peels away to reveal …

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A stack of button cells! And some cardboard paper to insulate it from the metal shell.

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No gooey mess inside, just button cells, end plates, and a springy piece of metal to apply pressure to the stack and ensure good contact.

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And in case you wondered just what size the button cells are, they’re the same size as this other cell in my collection, marked LR932.

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About lui_gough

I’m a bit of a nut for electronics, computing, photography, radio, satellite and other technical hobbies. Click for more about me!

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