Brand UltraFire Color Blue + black Quantity 2 Type Lithium Ion Model 18650 Mark Capacity 2500 Actual Capacity 2500 Battery Voltage 3.7 V Rechargeable Yes Rechargeable Times More than 300 times Built-in Protected Circuit Yes Over Voltage Protection Yes Short-circuit Protection Yes Over-charging Protection Yes Over-discharging Protection Yes Mercury Free Yes Application Provides power for flashlight Other Features Discharge stop voltage: 2.75V; Charger current: 200mA~500mA; Over charge checking voltage: 4.25~4.35V; Over charge cut-off voltage: 4.05~4.15V; Over discharge checking voltage: 2.5+/-0.1V; Over discharge cut-off voltage: 3.0+/-0.1V; Over-current protection current: 3+/-1A; Charging mode: CC / CA; Working temperature: 0~45'C; Discharge temperature: -20~60'C Packing List 2 x Batteries 1 x Protective case