Cool, use them, then just recharge, no need to discharge untill flat like in days of old. If your speedo has lipo cutoff make sure its switched on, if not, my daughter runs a 5000mah lipo in her touring car and can easily do 2 5min races including 2min warmup on one charge. Only being using lipos myself for about 8 months and was a bit daunting at first, just make sure you dont charge at to high a rate of amps. Have fun