This is the Traxxas Power Cell 7.4V 2200mAh 25C 2S LiPo Battery.                                                                                         FEATURES: Semi rigid construction does not require a hard case and eliminates wire harness connectors that can loosen and fail Engineered specifically to fit Traxxas models New high current connector with gold-plated copper terminals and      integrated balance connector iD Auto Battery Identification allows Traxxas iD equipped chargers to automatically set and optimize charge settings for specific battery  MAXX cable high-efficiency 16 gauge silicone jacketed wire                                                                                            INCLUDES: Traxxas Power Cell 7.4V 2200mAh 25C LiPo 2S Battery with High Current Connector and Integrated Balance Connector                                                                                                  REQUIRES: LiPo compatible charger such as the Traxxas EZ-Peak Plus, TRAP2970 LiPo charging bag                                                                                                                                     SPECS: Configuration: 2S2P                                                             Continuous Discharge: 25C (55A)                                                 Max Burst Rate: 50C (110A)                                                      Watt Hours: 16.28                                                               Charge Rate: 1C (2.2A)                                                          Max Charge Rate: 2C (4.4A)                                                      Dimensions: 3.5 x 0.83 x 1.2" (88 x 21 x 30mm)                                  Weight: 4.2oz (118g)                                                                                                                                  COMMENTS: ALWAYS use a LiPo-approved Charger                                              ALWAYS use a LiPo Cell Balancer                                                 NEVER Charge over 4.20V per cell                                                NEVER Charge at currents greater than 1C                                        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