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Fenix ARB-L21-5000 5000mAh 21700 Battery
Fenix 5000mAH 21700 Rechargeable Battery

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Price: $25.95

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


FENIX ARB-L21-5000 At-A-Glance

  • Fenix 21700 5000mAh high capacity battery
  • For high-intensity LED flashlights like the Fenix PD36R
  • Internal and external safety features
  • Built-in overcharge and over-discharge protection
  • Designed to last over 500 charge cycles
  • 12 month warranty period

Included in the Box

  • Fenix ARB-L21-5000 21700 Rechargeable Battery

Rechargeable Battery for Fenix PD36R

The Fenix ARB-L21-5000 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 PD36R flashlights!

Fenix 21700 5000mAh Battery

Simply charge the Fenix 21700 battery using the built-in charging feature of the Fenix PD36R or using another compatible battery charger. With built-in overcharging and over-discharge protection, the ARB-L21-5000 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.


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.
Average Customer Review: Average Customer Review: 5 of 5 5 of 5 Total Reviews: 4 Write a review.

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

  0 of 0 people found the following review helpful:
5 of 5 Paramedic January 6, 2022
Reviewer: Ruth Warren from Commerce, TX United States  
very pleased with item bought.  If there a good price for the charger on this item, thinking of buying for my son.

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  0 of 0 people found the following review helpful:
5 of 5 Lots of Power January 25, 2021
Reviewer: Stephen Maikisch from Palm Coast, FL United States  
The battery is powerful but the unique size of these various 21700 batteries makes them specific to one flashlight so if you have a few different lights it becomes a pain keeping which belongs where. Overall I love the light and the options it comes with.

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  0 of 0 people found the following review helpful:
5 of 5 The best quality November 28, 2020
Reviewer: Slowhand from Arizona, U.S.A.  
A very reliable and well-made product.  I have used Fenix for many years with not one failure in all conditions from extreme heat 120+ to snowstorm...  The most impressive was in a heavy rain of 8+ hours constant use that turned to a snowstorm before I got in out of the weather...  Great product...

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  0 of 0 people found the following review helpful:
5 of 5 Batteries July 15, 2020
Reviewer: Vrand from Rochester, NY United States  
Order arrived fast, safe and well packed. Batteries took the standard about 3-4 hours to charge from one bar. They work fine. Comes in original package with nice cases. Longhorn’s prices, selection, website navigation and shipping speed are great. Very happy with my purchase and would order from here again without hesitation.

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