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Fenix ARB-L21-5000U 5000mAh USB C Rechargeable 21700 Battery - Used
Fenix ARB-L21-5000U 5000mAh USB C Rechargeable 21700 Battery

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Price: $17.96

Quantity in Stock:3

Availability: Usually Ships in 24 Hours
Product Code: BAT-FX-21700-L21-5000U-USED


Used batteries/batteries used for testing in lightly used condition without original packaging. Batteries are charged and tested in flashlights to ensure their functionality. Batteries are shipped in a plastic battery organizer for safety.

FENIX ARB-L21-5000U At-A-Glance

  • Fenix 21700 5000mAh high capacity battery with outstanding performance
  • Suitable for high-intensity LED flashlights like the Fenix PD36R
  • Multiple protections with internal and external safety features
  • Built-in overcharge and over-discharge protection to increase battery lifespan
  • Designed to last over 500 charge cycles
  • 12 month warranty period from purchase date

Included in the Box

  • Used Fenix ARB-L21-5000U 21700 Rechargeable Battery
  • *USB-C Cable Not Included

Fenix 21700 5000mAh Battery

The Fenix ARB-L21-5000U is a high-performance, li-ion battery designed to power high drain devices that support 21700-size batteries like your favorite flashlights, lanterns, and more. We love to pair it with Fenix PD36R, TK22 V2.0, or TK22UE.

Direct USB-C Rechargeable Battery

Simply charge the Fenix 21700 battery using the built-in USB-C charging port or using another compatible battery charger. With built-in overcharging and over-discharge protection, the ARB-L21-5000U is designed to last over 500 charge cycles. The cathode, (positive button top) features a battery charging indicator: red for charging, blue for fully charged. A 12 month free warranty period means you will never have to worry about this battery leaving you in the dark.


Capacity 5000 mAh
Voltage 3.6 V
Charging Current (Recommended) 1 A
Charging Current (Maximum) 5 A
Dimensions L-2.99"xW-0.85"xH-0.85"
Weight 2.56oz

21700 Battery Compatibility

  • This is a button top battery designed for flashlights that accept standard 21700 batteries.
  • It does NOT work in any non-flashlight device.
  • It does NOT work in any flashlights that require a custom battery.
  • It does NOT work in any electronics that only accept flat top batteries.
  • It can be charged in a lithium-ion charger such as Fenix ARE-A2, Fenix ARE-A4.

Fenix ARE-A4 4-Slot Li-ion Smart Battery Charger
Price: $39.95

Fenix ARE-A4 Four Channel Battery Smart Charger for 14500, 16340, 18650 Batteries and More

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