Im using a 425amp lawnmower battery. Works great, and is very small, and 25$ rather then 60-80$ for a car battery. My friend has a 350amp lawnmower battery on his CA and it works great. But I looked up the battery spec's for an SR, and the amprage is 400min-520max. That is why I got the 425 rather then the 350, even though the 350 works fine.
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