when i change my esc and motor, do i also have to change the type of battery? right now i have a 2000 mAh 7.2V NiCd battery pack, and im planning to use a Dynamite Tazer 15T esc with a 19x2T orion method r motor. Do i have to get a battery thats like NiMH, or can i stick with NiCd?