I use 4000mah batteries for 2 races before swapping (to make sure they have plenty left). I'd say you would be good with 1 more so you could have 1 in your car while one on charge. Or go for 2 more and run 1 battery for practice and first heat, 1 for 2nd and 3rd heats, and the last one for 4th heat and final. may not be the best way but this works for me
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