Traxxas 3036 NiMH 5 Cell 6V 1100mAh Flat Rx Pack.
These high quality five-cell receiver battery packs use proven nickel-metal hydride (NiMH) cells and are rated at 1100 mAh. Fully charged, the battery pack provides about 1-2 hours of run time. Heavy-duty wiring provides efficient current transfer and extra protection against damage.