Fenix ARB-L18-3500U USB Rechargeable 3500mAh 18650 Battery
The ARB-L18-3500U battery can be charged by its built-in USB port or by an external battery 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!
Fenix ARB-L18-3500U mAh USB Rechargeable 18650 Battery Micro USB charging port lets you charge the battery directly
Protection circuit built in the anode with a riveted steel hat.
Riveted 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: Overcharge protection, Over-discharge protection, Short-circuit protection, and overheating protection
500 Charge Cycles: A properly maintained ARBL18 battery is designed to retain up to 75% of its original capacity at 500 full charge and discharge cycles.
**USB Cable NOT Included**
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Picked this up as a on helmet secondary due to it's small size and compatibility with button top 18650's. I'm impressed honestly, it's extremely bright and has decent runtime as far as I can tell. It's also very durable so far, my only complaint is the magnetic charging because of interference with survey equipment. However that can be avoided by keeping it a foot or so away from the instruments so it's not that big of a deal.