1,High Capacity Battery Pack BP28 2,Capacity:4400mAh 3,Output Voltage:3.7 to 4.2V 4, ... Weight:128g 5,2*18650 Rechargeable Li-io Model: High Capacity Battery Pack FEREI | BP28Specifications of BP28:Size: 87.2mm*42 ... .* 2x18650 Li-ion battery inserted with protection circuit board. High Capacity Battery Pack BP28