Fenix ARB-L18-3500U Built-in USB Rechargeable Battery

ARB-L18-3500U is a high capacity 18650 Li-ion USB rechargeable battery with a built-in micro-USB charging port. It also includes a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. These USB rechargeable batteries can quickly be charged without the need for a separate charger. This not only saves you money from purchasing a charger, but also provides the convenience of not having to carry around another device.

Micro-USB charging port
3500mAh high capacity
USB rechargeable batteries
Protection circuitry to prevent short circuits
Pressure vents to prevent explosions
500 charge cycles
Voltage: 3.6V
Charging Current: Recommended 1A, maximum 2A
Charging Current USB Port: 0.8A
Weight: 1.8 ounces (50.2g)
Size: Length: 2.8″ (70mm) Diameter: 0.7″ (18.6mm)
Indicator light on battery is red while charging, blue when charged

This will work in all of the current models that utilize a li-ion 18650 battery. A micro-USB charging cord is NOT included.