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Fenix ARB-L18U 18650 2600mAh 3.6V Protected Lithium Ion (Li-ion) Button Top Battery with Micro USB Charging Port - Clam Shell

Fenix ARB-L18U battery left side angle
Fenix ARB-L18U battery side profile
Fenix ARB-L18U battery left side angle
Fenix ARB-L18U battery side profile
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Fenix Micro-USB Rechargeable 18650 2600mAh Li-Ion Battery

Potent and Protected

The newest addition to Fenix's already high-caliber line of rechargeable batteries, the ARB-L18 2600U 18650 Battery is one of the most reliable and innovative batteries on the market today! Featuring a incredibly potent Lithium Ion chemistry, this impressive cell delivers 3.7 Volts of power and can hold a sizable charge of 2600 mAh, providing your high-drain devices with the energy they need for extensive use. But with great power comes great responsibility, and this 18650 comes with plenty of protections to ensure it functions safely. From built-in pressure relief valves in case the battery gets too hot to intelligent protection circuits to ensure there are no short circuits, this battery is as safe as it is effective.

Multiple Charging Methods

For the first time ever, Fenix is offering a battery that does not need a designated charger in order to recharge, a helpful feature that will make charging on the go quick and easy. In addition to being used in conventional Li-Ion chargers, the ARB-L18-2600U is designed with a convenient micro-USB port located on its side, allowing it to be refueled by one of the most common charging cables available! The cell even comes with a multi-colored LED power indicator that will let you monitor the charging progress of your cell and know when charging is complete.


  • Micro-USB charging port allows cell to be charged without conventional charger (Micro-USB Cable NOT Included)
  • Still capable of being charged in normal Li-Ion battery chargers
  • Three sets of overheat protection
    • Pressure Relief Valve Protection
    • Separate Micro-porous Protection
    • PTC Cathodal Block Protection
  • Sophisticated protection circuit built into the anode
  • Multicolored LED power indicator glows red while battery is charging, green when fully charged


  • Battery Size: 18650
  • Battery Chemistry: Lithium Ion (Li-Ion)
  • Nominal Voltage: 3.6V
  • Nominal Capacity: 2600 mAh
  • Max Discharge Current: 5200mAh
  • Max Charging Current: 2.0A (Charger), 1.0A (USB)
  • Recommended Charging Current: 1.0A (Both Charger and USB)
  • Estimated Charge Cycles: 500 cycles
  • Dimensions:
    • Length - 2.76" (70 mm)
    • Diameter - 0.73" (18.6 mm)
  • Weight: 1.76 oz. (50 g)
Battery Size:18650
Battery Capacity (mAh):2600
Battery Chemistry:Li-Ion
Battery Voltage:3.6
Battery Terminal Type:Button Top
Battery Shelf Life:10 Years
Product Certifications:CE, FCC, RoHS
Packaging:Retail Packaging
Warranty:Battery Junction 30-Day Warranty, Fenix 1 Year Warranty
Return Policy:Battery Junction Return Policy
Product Weight:1.764oz
Product Dimensions:2.756" (L) x 0.732" (Diameter)
Country of Origin:China
Associated Battery Sizes:168A, 18650, 19670, Protected 18650, Unprotected 18650
By Mike
September 13, 2021
Love these Fenix protected batteries with built-in USB charger. Fenix 18650ís and assorted adapters run everything I will need.
By Michael R.
Frisco, TX
Great battery -- mind the size
October 6, 2020
Good performance, but be sure your device can handle a cell that is actually 18.5 x 70 mm (rather than the 18 x 65 one might otherwise expect).
By Ken
on time and as ordered
July 11, 2020
Customer service was just great and the items arrived on time and as ordered. Put a charge on them just fine ... now we'll see how well they hold up. Thank you.
Washington state
April 12, 2018
Excellent battery easy to charge
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Fenix ARB-L18U 18650 2600mAh 3.6V Protected Lithium Ion (Li-ion) Button Top Battery with Micro USB Charging Port - Clam Shell

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