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Things to check:
size so it fits
max Amps it can give
polarity (sometimes + and - are reversed)
Other things are not really relevant. AH is the battery capacity, so if you have lots of power hungry things on your car, or alarm or things that can drain it when you dont use it, get a battery with high AH rating.
I do use a 10AH, 600Amax, 3lbs battery. But then i also use a cutoff switch every time i dont use the car.
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