From Michael James,
Your Guide to Radio Controlled Vehicles.
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Definition: Almost always the RC controller uses 4 or more "AA" or 9 volt alkaline or rechargeable batteries. By contrast, the RC vehicle itself uses a rechargeable battery pack to power the motor.

The battery pack is a group of rechargeable battery cells made out of either nickel cadmium (Ni-CD) or nickel metal hydride (Ni-MH) with a set of negative and positive terminals. The receiver and speed controller plug into the battery pack. Some electric RC vehicles include a charger for recharging the battery pack between uses.