Should have been replaced under warranty!

"As far as I can tell, the replacement ARB-L21-5000 V2.0 is fine however I was very disappointed that the original battery that shipped with my PD36R PRO failed after slightly more than a year. I purchased two units one in June 2025 and one in August 2025. I was told that the warranty on the battery was only one year so I ordered this replacement. Now I see that the same flashlight is being sold with an extra battery. My flashlight was hardly used when I noticed the failure. The whole episode leaves a sour taste regarding Fenix."

— George P. (3/5)

Battery is easy to charge

"Battery is easy to charge not too heavy lasts a good amount of time! I always get a second battery with every light I purchase."

— JONATHAN H. (4/5)

"Great battery! Lasts a long time"

— Virginia (5/5)

Works great, purchased to go

"Works great, purchased to go with the HR75 which is now my go to head lamp."

— samuel o. (5/5)

Quick tune up

"Purchased to replace battery in 3 year old E35R that is my EDC. I'll keep the old one charged for backup."

— Mikel O. (5/5)

Only works with 1 out of 6 flashlights.

"I have several Olight flashlights that use 21700 batteries, but this won't work in any except one. It works with a discontinued Seeker 2, but not my Baton 3 Pro Max, Seeker 4, either Warrior 3S, or my new Prowess."

— Big F. (1/5)

"Love these!"

— William (5/5)

"Great batteries to have even though the lights last so long!"

— William (5/5)

"Great batteries to have even though the lights last so long!"

— William (5/5)

Ive bought 3 more including

"Ive bought 3 more including the 5000mah battery that was included with the 2000 lumen headlamp along with a 4 slot charge worth every penny"

— dakota N. (5/5)