If you are looking at lipo's, make sure your ESC has a LiPo cutoff programming option, and that you stick to a 7.4volt 2 cell lipo, a 3 cell 11.1 volt will most likely fry your motor in about 30 seconds. You may be better off and safer just getting a better brand name NiMh battery, look at the mah number on the battery (ex: 1300mah). The larger that is the more flight time you will get.