Just got done charging my battery from my 10 minute main yesterday. 1 practise lap, geared 12t pinion, 30 degree on can, no timing in esc, Novak 4.5/Havok pro, 60c/5500mah battery and I put back 3895mah. I think a 10 minute main is max for these trucks unless we start using 8000 or more batteries.