Yep, 2 is Plenty, with a decent set of 5000 to 6000 mah I can run 2 heats without charging in a 2wd, in fact I ran 3 last night plus Practice laps but that was maybe pushing it a bit lol
In general a 5 min run will use 1200 to 1500 mah in a 2wd, 4wd I found was about 2200 per run.
They can be used more than once a day no problem, just try not to recharge when they are still warm after a run.
Main thing is not to run them flat, most speedos have a voltage cut off built in, and don't leave them plugged in after a race day
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