The Battery Pack Powers the Motor: Almost always the RC controller uses 4 or more "AA" or "AAA" or 9 volt alkaline or rechargeable batteries. By contrast, the RC vehicle itself often uses a rechargeable battery pack to power the motor.
Increasingly, lithium polymer or LiPo battery packs are being used in radio controlled vehicles. They generally charge faster and store more energy than a comparable Nickel Cadmium (NiCd) battery pack. However, LiPo batteries do require special handling. Misuse -- including improper charging, handling, and storage -- can cause LiPo batteries to burn or explode.