1,Rechargeable Battery Pack with 4*18650 BP4836 2,Capacity:8800mAh 3, ... .2V 4,4*18650 Rechargeable Li-ion Model: Rechargeable Battery Pack with 4*18650 FEREI | BP4836 Specifications of BP4836:Weight ... 7 to 4.2V Features of BP4836:* Professional lithium battery power pack , used for Bicycle Lamp B3/B5/B9 or Headlamp ... Jack and OD5.0mm cable .* 4x18650 Li-ion battery inserted with protection circuit board.