Foxnovo 3.7V 1200mAh 25C Rechargeable Lipo Battery for GYRO Hercules Unbreakable RC Helicopter ZX-35850 Material: Lithium polymer. Plug-type: JST plug. A LiPo balance charger (not included) is required to charge this battery, with the charging time about 30 minutes. Voltage: 3.7V. Capacity: 1200mAh. Maxi continuous discharge rate: 25C. Working temperature: 0C45C (charger); -20C60C (discharger).