Good advice above, just to add, you will possibly only need one battery, they stand recharge after recharge or topup after topup if you like, they come as 2cell stick packs or 1cell saddles - to suit car layout. May need to be BRCA approved for some meetings.
Only charge in lipo mode or you will have problems, you may need a fireproof bag to charge them in ask at club, never run till near flat, they won't recharge.
Most modern brushless esc's will have a cutoff to stop that happening.
The lipo's give more power, (we can get 2 x 5min heats if needed before recharge), are lighter and the car will fly, much easier than old cells, enjoy
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