melasta 8.4V 1800mAh Ni-MH High Power Battery Packs with Mini Tamiya Discharge Connector for RC Racing Cars MELASTA battery, the first choice of car powertrain for most top Formula SAE Racing Teams in the world since 2012 up to date! NiMH technology :No cell memory effect. Compatible with: popular standard 8.4V RC cars which with Mini Tamiya connector. Standard Dimension: 106.8*34.2*17.3mm/4.2*1.35*0.68inch. Warranty: 35- DAY return policy and 1 Year warranty.