3000mAh should be enough to do a race for most, I expect some of the top top guys (especially 4WD) could get close.
I used to quite easily do 2 races with a 6,000mAh pack and also with a 5,000 too, but I used to cut the practise laps a little and turn the end points down just to be sure.
If you're able to charge between races then just charge it, it'll only take twice as long to charge after 2 runs. I only used to run 2 races as I wasnt able to charge onsite so 3x batteries = 1x practise, 4x heats and a final.
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