This is the GrimRacer 4S 14.8V 5000mAh 40C LiPo Battery from AquaCraft. FEATURES: Designed and tested specifically for boat hulls and boat racing INCLUDES: GrimRacer 2S 7.4V 5000mAh 40C LiPo Battery with Deans Ultra Discharge Connector, ElectriFly style Balancing Plug and Instruction Sheet REQUIRES: LiPo compatible charger and balancer LiPo-safe charging bag SPECS: Voltage Rating: 14.8V Cells: 4 Rated Capacity: 5000mAh Discharge Rating: 40C Continuous, 80C Surge Max. Recommended Charge Rate: 1C (5.0A) Discharge Lead: 10 gauge wire with Deans Ultra connector Balancing Plug: ElectriFly style Dimensions: 6.34 x 1.77 x 1.50" (161 x 45 x 38mm) Weight: 19.7oz (557g) COMMENTS: ALWAYS use a LiPo-approved Charger ALWAYS use a LiPo Cell Balancer NEVER Charge over 4.20V per cell NEVER allow LiPo cells to exceed 140°F (60°C) during charging 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 the reach of children jxs 03/30/11 ir/jxs