Color Blue Brand N/A Model 18650 Quantity 2 Piece Material Li-ion Cell Type Lithium Ion Battery Model 18650 Head Type Flat Top Actual Capacity 2000 mAh Voltage 3.7 V Rechargeable Yes Rechargeable Times Others500 Built-in Protected Circuit No Over Voltage Protection No Short-Circuit Protection No Over-Charging Protection No Over-Discharging Protection No Mercury Free Yes Other Features Size: 18 x 650mm; Charge voltage: 4.2V; nominal voltage: 3.7V; charge current (Standard Charging)0.5C (Rapid charge)1.0C; standard charging method: 0.5CCC(constant current) charge to 4.2V then CV(constant voltage 4.2V)charge till charge current decline to0.05C; charging time (Standard Charging)3.0hours(Ref.) (Rapid charge)2hours(Ref.); Max. charge current: 1C(2000mAh); Max. discharge current 1C(2000mAh) Certification CE Packing List 2 x Batteries