Battery parameter: XPower 3500mAh 2S 25C Lipo Battery Capacity:  3500MAH 25C 30C Caution: Don’t over charge, or over discharge batteries. Don’t put it beside the high temperature condition. Don’t throw it into fire. Don’t throw it into water. Package Included: 1 x HJ Power 7.4v 3500mAh 2S 25C Lipo battery