Originally Posted by
howardcano
Best performance requires high capacity to maintain voltage over the run, and low Internal Resistance (IR). Both of these generally improve with increasing battery weight.
Battery IR isn't quite as important for 21.5T as it is for 17.5T, but a lower battery IR will still help.
Racers here in FL run 21.5 TC and when paired with the new chemistry Lipo
Lipo Batteries win or lose races no matter what binky class you run