1,Bike Light Battery Pack BP4872 2,Weight:235g 3,Capacity:4400mAh ... 8.4V 5,4*18650 Rechargeable Li-ion Model: Bike Light Battery Pack FEREI | BP4872 Specifications of BP4872:Weight:235gCapacity: ... : 7.2 to 8.4V Features of BP4872:* lithium battery power pack , used for Bicycle Lamp BL200 only.* extend ... Jack and OD5.0mm cable.* 4x18650 Li-ion battery inserted with protection circuit board.