This is the HPI Plazma 7.4V 4000mAh 20C LiPo Stick Pack Battery. FEATURES: Race legal sealed plastic case Balance plug Over 30% lighter than NiMH packs Deans Ultra Female plug INCLUDES: Plazma 7.4V 4000mAh 20C LiPo Battery with 12AWG Wire, Deans Ultra Female Plug, Balance Plug and Instructions REQUIRES: Cell balancer such as the Great Planes Equinox Balancer (GPMM3160) for balance charging LiPo compatible charger such as the Onyx 230 AC/DC Charger (DTXP4230 Charge lead with banana plugs and Deans Male Connector (DTXC2221) SPECS: Voltage: 7.4V Capacity: 4000mAh Current Rating: 20C Case Type: Sealed plastic Dimensions: 5.4 x 1.8 x 1.2" (138.6 x 46.6 x 30mm) Weight: 12.1oz (345g) 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 cld 10/27/11 ir/jxs