The box works very well with bike lights and it charges your cell phone too because it has the USB interface.
Features:
Can be packed into 4 * 18650 batteries and combined them to bicycle lights powered.
Output voltage 8.4V, Input voltage 8.4V.
With nylon adjustable fasten tapes easy to attach on the bicycles.
2 Standard Interface (USB 5.0 diameter 1.5cm, DC 8.4 diameter 1cm).
The battery box is suitable for the 18650 3.7V rechargeable lithium battery.
The DC port supply for 8.4v products or bike light.
The USB port could charge the mobile phone and other product.
Unique case cover with a big screw, 4 copper spring circle and silicone water resistant ring.
Three level battery indicator help you know the battery status.
Specification:
Material: ABS
Color: Black / Red / Green / Blue(Optional)
Size: 4.5 * 4.5 * 9cm / 1.7 * 1.7 * 3.5oz
Weight: 122.6g / 4.3oz
Package Size: 7 * 7 *10 / 2.7 * 2.7 * 3.9
Package Weight: 139g / 4.9oz
Package List:
1 * Battery case (no battery)