This is the DuraTrax NiMH 8.4V 2500mAh Onyx Hump Battery Pack with Traxxas Connector. FEATURES: Ideal sport pack for Traxxas cars, trucks and boats YOU WILL RECEIVE: DuraTrax NiMH 8.4V 2500mAh Onyx Hump Battery with Traxxas Connector REQUIREMENTS: NiMH compatible charger such as the Duratrax Onyx series Female Connector to Molex Male Connector Adapter, TRAC3061 (if using Onyx charger) SPECIFICATIONS: Capacity: 2500mAh Number of Cells in Series: 7 Rated Voltage: 8.4V Min. Discharge Voltage: 6.3V Maximum Recommended Charge Current: 4 amps Discharge Lead: 14AWG 2.7" (70mm) long wire w/Traxxas connector Pack DIMENSIONS: 5.2 x 1.9 x 1.7" (131 x 47 x 43mm) Weight: 14 oz (383 g) Number of Welds per Connection: 6 spot welds Cell Size: Sub-C