Home > Brands > Fenix > Batteries and Chargers >

Fenix ARB-L21-4000P 4000mAh 21700 Battery
Fenix 4000mAH 21700 Rechargeable Battery

Alternative Views

Price: $26.95

Availability: Usually Ships in 24 Hours
Product Code: BAT-FX-21700-ARB-L21-4000P


FENIX ARB-L21-4000P At-A-Glance

  • Fenix 21700 4000mAh high capacity rechargeable battery
  • Designed to be used with Fenix LR35R
  • 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

  • Fenix ARB-L21-4000P Rechargeable Battery

Rechargeable Battery for Fenix LR35R

The Fenix ARB-L21-4000P is a high-performance battery designed to power 21700 high drain devices like your favorite flashlights, lanterns, and more. We love to pair it with Fenix LR35R flashlights!

Fenix 21700 4000mAh Battery

Simply charge the Fenix 21700 battery using the built-in charging feature of the Fenix LR35R or using another compatible battery charger. With built-in overcharging and over-discharge protection, the ARB-L21-4000 is designed to last over 500 charge cycles. A 12 month free warranty period means you will never have to worry about this battery leaving you in the dark.


Capacity4000 mAh
Voltage3.6 V
Charging Current (Recommended)1 A
Charging Current (Maximum)4 A
DimensionsL-2.99" x W-0.85" x H-0.85"
Weight2.47 oz
Average Customer Review: Average Customer Review: 5 of 5 5 of 5 Total Reviews: 1 Write a review.

  0 of 0 people found the following review helpful:
5 of 5 Great experience! December 23, 2022
Reviewer: David Hord from Stanley , NC United States  
Easy to order, great prices, and on time delivery!

Was this review helpful to you?

Browse for more products in the same category as this item:

Brands > Fenix > Batteries and Chargers