1. Factory price 2.OEM is welcome 3.CE, FCC certificate 4.high quality Rechargeable lithium polymer battery pack.3.7V850mAh 1700mA dischargeISO 9001 UL ... , recording the discharging time.≥300min5.21C CapacityAfter standard charging, rest battery for 10min, then discharging at 1C to voltage 3.0V ... time.≥240min 3. product photoes4.More Type For your choices Rechargeable lithium polymer battery pack