heat and LiPo batteries do not mix well together. You need to let your batteries cool down before you recharge them. Don’t do it right after. This is why extra LiPo batteries are needed if you want to be able to fly continually. If you fly aggressively with your RC Helicopter, you will need to let your Eletric Motor and ESC (Electronic Speed Controller) cool down. This is really dependent on the motor and ESC you buy. You may have to wait 15minutes before your next flight to make sure that the electronics don’t fry.