You don't mention what kind of car you are driving, in my experience with a 10.5 turn in a 2wd buggy, we are using around 1500 to 1800 mAh during a 5 minute race. My sons driving isn't the best so some of race is waiting for marshalls! but a 3600 would be ample to finish a race.
A 4wd will use a bit more and a truck a bit more again I would guess.
We use 3 packs, one for practice and 2 for racing but we could get away with 1, it's just that having more takes some of the stress out of the day.
2 would be plenty.
By square, I assume you mean saddle packs? Saddles are more versatile as you can use them in any chassis type so if you think you may change car in the near future, it might be better to get them and you won't need to buy new batteries.
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Team C TC02c - My son breaks it, I fix it.
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