lipos can be re-charged over and over again from half flat state so you might only need the 1 set. If charged at 1c you should be able to recharge within the hour easily.
I found racing at my local club with 2 packs was manic and I constantly had to have the 1 charging and the other in the car. I now have 4 packs so I don't have to worry too much.
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