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Fenix ARB-L18-3500U 18650 3500mAh 3.6V Protected Lithium Ion (Li-ion) Button Top Battery with Micro USB Charging Port

11 reviews

Following a global shortage of lithium-ion batteries, Fenix is no longer able to produce the ARB-L18-3500U batteries. The units we have in stock are the last ones we'll have. No price match can be offered on this product. Thank you!


The ARB-L18 3500U battery can be charged via its own USB port or with a conventional charger. 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 greatly reduced.


  • Micro USB charging port lets you charge the battery directly or in a charger
  • Protection circuit in the Anode to prevent short circuit
  • Multiple layers of protection
  • 500 charge cycles can be expected from a properly maintained battery.
  • Fully covered with a riveted steel shell for impact resistance
  • Overcharge, discharge, short circuit, and overheating protection

Technical parameters, below:

     Fenix ARB-L18-3500U 18650 3500mAh 3.6
    Customer Reviews
    4.5 Based on 11 Reviews
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    Great Battery

    Have charged it over and over. Holds a charge for a long time.

    Richard L.
    Satisfied customer

    Quick delivery, love the USB Charging feature. Great product for an awesome flash light.

    Glen M.
    Canada Canada
    Derek K.

    its perfect for my husbands flashlight at work if the battery goes dead he can charge just the battery does not need a separate charger

    Jennifer M.

    Was able to locate the perfect battery for my new Fenix flashlight. Having the USB charger on the battery itself, avoided unnecessary need for a charger. Service, shipment was fast.

    Shawna D.