This is the DuraTrax Onyx 7.4V 5000mAh 25C Hard Case LiPo Battery with the Dean"s Ultra Connector. FEATURES: Ideal for 1/10 scale car applications Prewired with Dean"s Ultra Connector INCLUDES: 7.4V 5000mAh 25C Hard Case LiPo Battery with Dean"s Ultra Connector REQUIRES: Balancer and LiPo compatible charger or LiPo charger with built-in balancer such as the Onyx 235, DTXP4235 SPECS: Voltage Rating: 7.4V Rated Capacity: 5000mAh Discharge Rating: 25C continuous Dimensions: 1.77 x .94 x 5.4" (45 x 24 x 137mm) Weight: 10.2oz (288g) Discharge Lead/Connectors: 12AWG Wires, Dean"s Ultra Balancing Connector: ElectriFly Watt Hours: 37Wh COMMENTS: ALWAYS use a LiPo-approved Charger ALWAYS use a LiPo Cell Balancer NEVER Charge over 4.2V per cell NEVER Charge at currents greater than 1C NEVER Charge through the "To ESC or "DISCHARGE" lead NEVER Trickle Charge NEVER allow to Discharge below 2.5V per cell NEVER disassemble or modify pack wiring in any way or puncture cells NEVER place on combustible materials or leave unattended during charging ALWAYS Charge in a fireproof location ALWAYS set charger"s output volts to match battery volts ALWAYS keep out of reach of children All weights include wire leads and plugs All weights +/- 1 g jxs 06/30/11 ir/jxs