6V Tenergy 3300mAh NiMH Hump Battery Receiver Packs with Tamiya and JR Connector made of Nimh Sub C 5 cells with JR Connector and Tamiya connector fit 1/5 Scale vehicles like the HPI Baja 5B 2.63" (Long)1.8" (Height);1.8" (Width) Rapidly charge up and long cycle life