Fenix ARB-L18-3500 3500mAh 18650 rechargeable battery lying on its side
Fenix ARB-L18-3500 18650 Li-ion battery with anode protection circuit, short-circuit protection, and 500 cycles
Close-up of the ARB-L18-3500 positive end, showing its pressure relief vent
ARB-L18-3500 graphic showing 500 charge cycles while keeping up to 75% of original capacity
ARB-L18-3500 cutaway diagram of its anode protection circuit and three overheat protections
ARB-L18-3500 battery beside its steel shell, showing short-circuit protection
ARB-L18-3500 technical parameters table with capacity, voltage, charging current, weight, and size
Fenix ARB-L18-3500 3500mAh 18650 rechargeable battery lying on its side
Fenix ARB-L18-3500 18650 Li-ion battery with anode protection circuit, short-circuit protection, and 500 cycles
Close-up of the ARB-L18-3500 positive end, showing its pressure relief vent
ARB-L18-3500 graphic showing 500 charge cycles while keeping up to 75% of original capacity
ARB-L18-3500 cutaway diagram of its anode protection circuit and three overheat protections
ARB-L18-3500 battery beside its steel shell, showing short-circuit protection
ARB-L18-3500 technical parameters table with capacity, voltage, charging current, weight, and size

Fenix ARB-L18-3500 High-Capacity 18650 Battery - 3500mAh

$24.95
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The ARB-L18-3500mAh 18650 battery from Fenix is a high-grade model with an impressive 3500mAh rating, providing superior performance and reliability. It is equipped with protective features like short-circuit prevention, multiple layers of protection, and a button-top design that is suitable for a variety of Fenix LED flashlights. Rechargeable, reliable, and long-lasting, the 18650 series is the ultimate choice for high performance lighting.

Note: This item is packaged and priced as one battery. 

Shipping Note: Lithium ion batteries are considered "dangerous goods" per US transportation regulations and can often only be transported via ground shipment. Orders containing loose batteries will typically take much longer than predicted to be delivered. Delivery times of 14+ days are common.  

  • Fenix ARB-L18-3500mAh Rechargeable 18650 Battery
  • Button-Top Design
  • Protection circuit built in the anode with a steel hat by riveting process
  • Steel shell eliminates the risk of short circuit caused by collision and impact
  • Pressure Relief Vent: Expels waste gas generated by internal short circuit
  • Expelling waste gas prevents a cell from inflating or exploding
  • Three Sets of Over-Heat Protection: Over-charge protection and over-discharge protection Short-circuit protection Overheating protection
  • 500 Charge Cycles: A properly maintained ARB-L18 battery is designed to retain up to 75% of its original capacity at 500 full charge and discharge cycles. 
  • Fenix ARB-L18-3500 Rechargeable 3500mAh 18650 Battery

Overall rating: 4.8923078 / 5 from 715 reviews.

AI Generated Review Summary

The Fenix ARB-L18-3500 High-Capacity 18650 Battery is highly regarded for its impressive 3500mAh rating, providing superior performance and reliability. Customers praise its high quality, long-lasting power, and excellent customer service. The battery's protective features and rechargeability make it a top choice for high-performance lighting needs.

Summary topics

  • Light Performance (10%): Customers expressed satisfaction with the light, describing it as great, excellent, fantastic, and the best they've ever owned.
  • Customer Service (4%): Customers loved the great service provided by Fenix, which was mentioned multiple times in the reviews.
  • Value for Money (4%): It was noted by customers that this battery has the best capacity of any they have found in a 18650 size.
  • Battery Life (4%): It was highlighted by customers that the product has a great life. (Fenix ARB-L18-3500 High-Capacity 18650 Battery)
  • Power Output (4%): Customers expressed satisfaction with the power provided by the batteries, which was mentioned multiple times in the reviews.

Review topics: [].

Review highlights

  • "High power, long life at full charge." — Lee S.
  • "Excellent service and shipping was fast" — brian k.
  • "Holds charge well,impressive life" — David N.

Reviews

"I was devastated when my Fenix flash like stoped working. Then when i figured out it was just the battery, the first thing i did was check their site for the correct replacement battery and there it was! Right after I ordered it, Jess from Fenix reached out and told me the order for my new battery and flash light have been confirmed and then when it arrived she asked how I liked the product and if the new flashlight was working well. So great costumer service! Wont be going anywhere for my battery and flashlight needs!"

— Stephen (5/5)

Best battery for best headlamp—not immortal

"I suppose I’m rating the headlamp (HM65R) as much as the battery, as it’s the only application I’ve used the battery in, but it truly provides next level brightness (amazing for trail running at night). I have noticed a pretty significant drop in battery life after about a year with the brightness automatically fading (earlier than when I first got it). But at full charge, it’s amazing. I wonder if they could improve on the longevity though."

— Jeremy S. (4/5)

Awesome

"Best compact flashlight I've used and I have a stack of personal flashlights. We have starlight for issue and my personal Fenix outshines easier to charge and that area is protected So it's almost impossible to break. I ordered it because our starlight never are charged or broken and one of our guys has one. Everyone borrows my Fenix it's been borrowed so much im going to have to buy another one soon, because someone else always needs it. Thanks graveyard shifter."

— John G. (5/5)

Works good. My husband loves

"Works good. My husband loves it"

— Ashley S. (5/5)

Some of the best products available.

"Have bought several fenix products and have never been disappointed has always been an amazing product and have lasted for years. The only thing this time around is taking much longer to receive the package, but I have confidence and patience in there company’s delivering system worth the weight in time"

— Jerry j. (5/5)

Make sure you order correct

"Make sure you order correct one, one needs an external charger and one has micro USB port on side of battery. Two slightly different part numbers. Love the battery."

— Jim J. (5/5)

"Was supposed to be delivered on the 15, now it's the 21st and still no updates"

— Juergen (1/5)

Fenix Battery

"Good quality battery"

— David N. (5/5)

Customer Service Never Responded

"I emailed customer service because the battery didn’t fix the issue, inquired about servicing the flashlight it self and never heard back. 0/10."

— Derek B. (1/5)

"Solid batteries, expensive, but high quality."

— Keenan (5/5)

Q&A