This high quality 5-cell hump pack uses proven nickel-metal hydride cells and is rated at 1200 mAh. Fully charged, it provides about 1 hour of run time. Heavy-duty wiring provides efficient current transfer and extra protection against damage. Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long-lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your user's manual for exact parts listings.