1,Rechargeable Battery Pack with 4*18650 BP4836 2,Capacity:8800mAh 3,OutputVoltage:3.7V ... 4.2V 4,4*18650 Rechargeable Li-ion Model: Rechargeable Battery Pack with 4*18650 FEREI | BP4836Specifications of BP4836:Weight:235gCapacity: 8800mAhOutput ... .5 DC Jack and OD5.0mm cable .* 4x18650 Li-ion battery inserted with protection circuit board. Rechargeable Battery Pack with 4*18650 BP4836