1,Rechargeable Battery Pack with 4*18650 BP4836 2,Capacity:8800mAh 3,OutputVoltage:3.7V to 4.2V 4,4*18650 Rechargeable Li-ion ... Model: Rechargeable Battery Pack with 4*18650 FEREI | BP4836 Specifications of ... : 3.7 to 4.2V Features of BP4836:* Professional lithium battery power pack , used for Bicycle Lamp B3/B5/B9 or ...