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This is not an answer, but a warning.

A 12v lead-acid battery of that size has the strength to literally melt your face. The amperage it can put out makes it very dangerous. It is likely able to spot weld metal if you drop something across the contacts, and poses an explosion hazard. If you don't know what you're doing with soldering/wiring/managing power, do not learn with trial and error.

I'm not sure how familiar you are with these things, but please, be safe :)