High-performance rechargeable battery

With a large capacity of 4000 mAh, the ARB-L18-4000U 18650 battery provides long runtime for the most powerful Fenix lights.

Multiple protections

Its riveted steel casing, gas release vents and integrated electronic protections ensure safe use.

The battery charges directly via its USB-C port.

It can also be charged using the FENIX A2/A4/D1/D2 chargers or directly in the torch if it has a charging port.

Technical specifications

  • Capacity of 4000 mAh, 3.6V
  • The battery can be charged in the device, in a suitable charger or via its UCB-C port
  • Protection against short circuits, overcharging and overvoltage
  • The full recharge time is estimated at 3.5 hours
  • It is designed to retain 70% of its initial charge after 500 full charges
  • Dimensions: diameter 18.75 mm, length 72 mm
  • Weight: 55 g

Included in packaging

  • Accu ARB-L18-4000U