Battery model: 21700 Li-ion battery 4000mAh
Nominal voltage: 3.6V
Charging voltage: 4.2V
Nominal capacity: 4000mAh
Standard charge current: 0.5C
Max continuous charge current: 6A
Standard discharge current: 0.5C
Max continuous discharge current: 50A
Cell dimension: Cylinder 21*70mm
Cell weight: 70g   
PCB: Available                         
Connector: Available
21700 li ion battery