Fenix LightingFenix LightingFenix Lighting

Fenix ARB-L21-5000U Rechargeable Battery

$34.00 $25.95

Shipping calculated at checkout.
Out of stock

ARB-L21-5000U is a high capacity 21700 Li-ion USB rechargeable battery built for more power and longer runtimes. This battery has its own USB-C charging port for quick/easy charging without the need for a separate charger. Additional features include a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. Pressure relief vents which expel waste gas in the rare case of an internal short circuit preventing an explosion. Battery capacity up to 5000mAh. 500 charging cycles. This product will only work in those models supporting 21700 batteries. A USB-C charging cord is NOT included. Important Note:

THIS BATTERY IS NOT COMPATIBLE WITH 18650 FLASHLIGHTS OR OLDER STYLE CHARGERS. COMPATIBLE CHARGERS ARE THE FENIX ARE-A2, ARE-A4, ARE-D1 OR ARE-D2.

SKU: ARB-L21-5000UN/ABarcode: 6942870369358N/A

For commercial orders and large purchases, contact us at (888) 775-9996 x6 or GET A QUOTE

WARNING. Be aware of counterfeit Fenix merchandise in the U.S. marketplace. READ MORE >>

More Information

Specifications of the ARB-L21-5000U Rechargeable Battery

  • 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
  • Compatible with the E35 V3.0, HT18, LR35R, LR50R, PD36R, PD36 TAC, PD40R V2.0, Tk16 V2.0, TK20R V2.0, TK22 V2.0, TK22 UE, and TK30.

Capacity: 5000mAh
Voltage: 3.6V
Charging Current: Recommended 1A, maximum 5A
Weight: 2.6 ounces (72.5g)
Size: Length: 2.99″ (76mm) Diameter: 0.85″ (21.5mm)
Warranty Period: 12 month from date of purchase

Customer Reviews

Based on 173 reviews
91%
(158)
6%
(10)
1%
(1)
1%
(2)
1%
(2)
J
Joseph Beckish
Batteries are excellent

The last time I bought these batteries was 3yrs ago there is still quite a bit of energy left to them. I just wanted some more they are excellent batteries.

J
Joseph Johnson
Great Product!

Really like Fenix flashlights. It's great having a rechargeable battery backup.

K
K.M.
Amazing battery

I have two batteries 5000mAh - one turns blue when fully charged, however the other only turns to green.

What does the green light mean ????

Is it fully charged or faulty ?

Blue or green is fully charged. Simply a difference of what little light inside the battery was available at the time the lights were manufactured based on supply chain. Red is always in need of charging/charging, and then they will turn green or blue to indicate fully charged.

A
Ax
Battery wasn't the problem

When my three-year-old headlight started acting wonky I assumed it was a battery and replaced it with a new one but it wasn't the battery.

Unfortunately.

Headlamp no longer works.

How do I give a star rating to a product like a battery and one that I didn't use?

My life is too busy to be bothered with the return process.

Was a nice headlamp when it was working....

Unfortunately, without talking to our warranty department to explain to them what is going on, it's impossible for me to attempt to troubleshoot the issue with you. Our lights have a 0.25 warranty rate, so while it's rare, things can happen. But our warranty team would be the best people to assist you. I can ask them to reach out to you, although you have already stated that you are too busy to be bothered with a return (or presumably talking to warranty). I will still ask them to reach out though. Their message may end up in your spam folder.

K
Kevin Keen
Nothing wrong with product

Like my light and battery...just NOT the 100's of emails I keep getting. Can't a person just buy something and be done???

You can unsubscribe to the emails via the link at the bottom of any of the emails. We at Fenix Lighting generally only send one email per week. But again, you can easily unsubscribe via the link on the email.

*Updated to add: I messaged our tech team before replying to you to have you removed from our mailing list, and was told your email was not on our list. You might be getting emails from Fenix Store, which is a completely different company than us. I assume their emails also have the option to unsubscribe.

J
James G
ARB-L21-5000U RECHARGEABLE BATTERY

I recently purchased an HT32 Flashlight which is perfect for my use during my remote deer hunts. I later realized that recharging the battery while on these remote hunts could be problematic so I decided to get a backup battery for the unit. Glad I did.

Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday
January,February,March,April,May,June,July,August,September,October,November,December
Not enough items available. Only [max] left.
Shopping cart

Your cart is empty.

Add an Order Note (optional)Edit Order Note