Fenix ARB-L18-3500U USB Rechargeable Li-ion 18650 3500mah Battery

Single Piece listing. 

The ARB-L18-3500U battery can be charged by its own USB port and by the charger as well. A protective circuit is built into the anode and covered with a riveted steel hat. The battery is fully covered with the steel shell, thus the potential risk of short circuiting caused by collision or impact is hugely eliminated.

Features
- Fenix ARB-L18-3500U Rechargeable Li-ion 18650 Battery 
- Built-in Micro-USB charging port 
- LED to indicate if battery is done charging 
- Protection circuit built in the anode with a steel hat by riveting process. Steel shell eliminates the risk of short circuit caused by collision and impact. 
- Pressure Relief Vent: Expels waste gas generated by internal short circuit. Expelling waste gas prevents a cell from inflating or exploding. 
- Three Sets of Over-Heat Protection:  Over charge protection, Over discharge protection, Short circuit protection, and overheating protection 
- 500 Charge Cycles: A properly maintained ARB-L18 battery is designed to retain up to 75% of its original capacity at 500 full charge and discharge cycles.