Veeki? High Capacity 8 x 18650 8.4V 8800mAh Protected Rechargeable lithium ion Battery pack for Bicycle Light or headlamp Replacement battery pack for Bike Light Headlamp Bicycle Head Torch. Lithium Ion 18650 rechargeable battery pack Made of 8 18650 cells with PCB and poly switch for full protection Battery tested based on International Electrotechnical Commission (IEC) standard to ensure capacity, quality and life time. Ideal for device that require large capacity but very small discharge current