Venom 8.4V 4200mAh 7-Cell Hump NiMH Battery with Universal Plug (EC3/Deans/Traxxas/Tamiya) x4 Packs Battery Type: Nickel Metal Hydride (NiMH) Battery Capacity: 4200mAh Volts: 8.4V Plug Type: Venom UNI Plug. Compatible with Traxxas Plug, Tamiya Plug, Deans Plug & EC3 Plug.