6200mah cells will probably be 30-50g heavier than 5000/5200 cells which a lot of people use.
Depending on motor and class (2 or 4wd) and the surface you are running on will determine how much you take out the cells. Usually 1500-2500mah during a 7 minute run (practice laps + race).
You could theoretically do two runs on one pack. But its best to recharge between runs. 2 packs are fine for this. As you can do your run. Let the cells cool for 10 minutes and then recharge. Which should take about 30-40 minutes.
You then still have the other pack of cells ready for your next run so no need to worry about getting it ready as you should have plenty of time.
It's also best not to run lipos right down.
Just thought. I'm making the assumption you are racing 1/10th off road.
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