Fenix ARB-L18 3500U 18650 Li-ion Build-In USB Charging Port Rechargeable Battery

Fenix ARB-L18-3500U is a high capacity 18650 Li-ion 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. This battery can quickly be charged without the need for a separate charger, need to mention an external charger will charge the battery faster and more convenient in most situations. This batter will work in all of the models that utilize the standard Li-ion 18650.


** Please note micro-USB charge cord sold separately



In stock


  • Type 18650 Rechargeable Battery
  • 3500mAh high capacity
  • Micro USB charing port lets you charge the battery directly using regular micro USB cable
  • 500 charge cycles
  • Protection circuitry to prevent short circuits
  • Pressure vents to prevent explosions
  • Warranty Period: 12 month from date of purchase



  • 3500mAh


  • 3.6v

Charging Current:

  • 0.8A (using Build-in USB Charging Port), 1A (using External Charger)


  • Length: 70mm (2.8″)
  • Diameter: 18.6mm (0.7″)


  • 50.2g (1.8 oz.)


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