Best battery is lithium. They're retardedly lightweight and super buff vs abuse. The price point is not great but when you end up with a 6lb battery who's to complain? You can even remove all the battery cable that runs through the car and weighs 10+lbs and just mount the thing up front since they're so small / light.
You do need to make sure you get enough capacity for your intended use of the car, and also have someone recode you for the reduced capacity over pb acid.
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