Bias 8.4V 5000mAh Hump Pack NiMH Battery with Universal Plug Battery Type: Nickel Metal Hydride (NiMH) Battery Capacity: 5000mAh Volts: 8.4V Plug Type: Venom UNI Plug. Compatible with Traxxas Plug, Tamiya Plug, Deans Plug & EC3 Plug.