Just get some quality hard case LiPos and be done with it. I put off getting LiPos and was using NiMH in my son and I's SC10s. We recently picked up a couple of 5000 mAh LiPos and the difference is night and day. One car is RTR with the Reedy 3300kV motor and the other has a Castle Sidewinder 5700 combo and they RIP with the LiPos. Don't even waste your $$$ on old battery technology.