This is the DuraTrax NiMH 7.2V 4200mAh Onyx Stick Battery Pack with Traxxas Connector.FEATURES: Ideal sport pack for cars, trucks and boatsINCLUDES: DuraTrax NiMH 7.2V 4200mAh Onyx Stick Battery with Traxxas ConnectorREQUIRES: NiMH compatible charger such as the Duratrax Onyx series Female connector to Molex Male connector adapter, TRAC3062 (if using Onyx charger)SPECS: Capacity: 4200mAh Number of Cells in Series: 6 Rated Voltage: 7.2V Min. Discharge Voltage: 5.4V Maximum Recommended Charge Current: 4.2 amps Discharge Lead: 14AWG 2.7" (70mm) long wire w/Standard connector Pack Dimensions: 5.3 x 1.8 x 0.94" (135 x 45 x 24mm) Weight: 14 oz (396 g) Number of Welds per Connection: 6 spot welds Cell Size: Sub-C jxs 8/17/10 ir/jxs