Color Black Model SingFire Quantity 1 Piece Material Lithium Cell Type Lithium Ion Battery Model Others18650 battery power bank Mark Capacity 6600 mAh Actual Capacity 6000 mAh Voltage 8.4 V Rechargeable Yes Rechargeable Times Others500 Built-in Protected Circuit Yes Over Voltage Protection Yes Short-Circuit Protection Yes Over-Charging Protection Yes Over-Discharging Protection Yes Mercury Free Yes Interface 5.5 x 2.5 mm Battery Pack Form 5.5 x 2.5mm Other Features Can be use in bike light headlamp Packing List 1 x 18650 rechargeable batteries pack (54cm-cable) 1 x Battery bag