Traxxas 2951X Series 4 4200mAh NiMH 7-Cell, 8.4V Battery (hump pack) New iD-Equipped Power Cell batteries deliver unmatched speed, acceleration and power in all Traxxas cars, trucks, and boats Premium quality, low-resistance cells; flexible, silicone-jacketed 12AWG wire; heavy-duty welded tabs; and Traxxas' High-Current Connectors Precision assembly with attractive, individually wrapped cells and clear overwrap complete the package Traxxas capacity ratings reflect the minimum capacity for the pack, not the maximum 4200mAh NiMH 7-C (Hump Pack) 8.4V Battery for Traxxas 1/10 scale vehicles or larger