Fenix ARB-L21-5000U USB-C Rechargeable 21700 3.6v 5000U mAh Li-ion Battery

Model: FF-ARB-L21-5000U
Manufacturer: Fenix Flashlight
In stock (Usually Ships in 24-48 Hours)


Fenix ARB-L21-5000U is a USB-C rechargeable, 3.6V 21700* Li-ion Battery with a 5000 mAh capacity. Built for more power and longer runtimes it has a USB-C charging port for quick/easy charging without the need for a separate charger. This is a 5000 mAh high-capacity battery with outstanding performance and a long life with up to 500 charging cycles. Dimensions: Height: 2.99" Diameter: 0.85"

Brand new, direct from Fenix Flashlights.

Note: Only compatible with 21700 powered lights. Not compatible with 18650 flashlights or older style chargers. Charging cord NOT included.

Compatible chargers: ARE-A2, ARE-A4, ARE-D1 or ARE-D2.


  • 5000mAh high capacity
  • USB Type-C rechargeable battery
  • Protection circuitry to prevent short circuits
  • Pressure vents to prevent explosions
  • 500 charge cycles
  • Indicator light on battery is red while charging, blue when charged


Battery Type Lithium Ion (Li-Ion)
Voltage 3.6V
Capacity 5000 mAh
Protection Circuit Yes
Rechargeable Yes
Charge Cycles 500 cycles
Weight 2.60 oz.
Country of Manufacture China