Brand SingFire Color Blue Material Lithium Quantity 1 Type Lithium Ion Model 18650 Mark Capacity 6600 Actual Capacity 6600 Battery Voltage 8.4 V Rechargeable Yes Rechargeable Times 500 times Buitl-in Protected Circuit Yes Over Voltage Protection Yes Short-circuit Protection Yes Over-charging Protection Yes Over-discharging Protection Yes Mercury Free Yes Application Can be used for bike light headlamp Other Features Batteries pack interface: DC 5.5 x 2.5mm female; 6 x 18650 rechargeable lithium batteries pack Packing List 1 x 18650 batteries pack (43.5cm-cable) 1 x Protection bag