Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping on Most USA Orders
Some products sold on this website may expose you to chemicals known to the State of
California to cause cancer, birth defects, or other reproductive harm.
All electrical products must be installed by a qualified electrician in accordance
with local wiring regulations. Incorrect installation may result in fire, electric
shock, or injury.
Always disconnect power at the circuit breaker before installation.
💡
Bulb & Usage Advisory
Do not exceed the maximum wattage specified on the fixture label.
Keep away from flammable materials. Allow adequate ventilation around the fixture.
Keep out of reach of children. Not suitable for wet locations unless rated IP65 or higher.
The Fenix ARB‑L18‑3500 is a high-capacity 18650 rechargeable Li‑ion battery, offering 3,500 mAh within a standard size that fits most high-performance flashlights. Built for safety and durability, it includes a button-top design, integrated protection circuitry against overcharge, over-discharge, short-circuit, and overheating, plus pressure relief vents to prevent buildup and reduce risk of swelling or rupture. A robust steel-infused anode structure further improves impact resistance and electrical safety. This cell is rated for up to 500 charge cycles, maintaining around 75% capacity afterward, and carries Fenix’s 12-month warranty.
Design: Button-top, compatible with Fenix and other 18650 devices
Durability: Up to 500 charge cycles, retains ~75% capacity over time
Size & Weight: Approx. 69 mm length × 18.6 mm diameter; ~50 g
Warranty: 12-month manufacturer’s warranty
A reliable, long-lasting, and safe power solution—perfect for tactical flashlights, headlamps, lanterns, and high-drain devices.
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 not uncommon.
⚠️ WARNING (California Proposition 65): This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, please visit www.P65Warnings.ca.gov.
I used the Fenix ARB-L18 in my headlamp for hiking, and while it charged quickly, the battery didn't last as long as I expected for such a high capacity. It’s good for short trips but I wouldn’t rely on it for longer outings. Just okay for me.
C
Carlos Ramirez
Great Battery Life for My Flashlight
I bought the Fenix ARB-L18 3500U for my tactical flashlight, and it's been fantastic! The USB rechargeable feature is super convenient, and the battery lasts a long time between charges. No more fumbling for spare batteries when I'm out camping!
M
Mina Takahashi
Useful but Slightly Expensive
The Fenix ARB-L18 is pretty solid and works well in my portable fan. However, I feel it's a bit pricey for just one battery. Still, it does its job well and the USB charging is a major plus!
L
Liam O'Sullivan
Arrived Defective, Very Disappointed
I was excited to try the Fenix rechargeable battery, but it arrived not holding a charge at all. Tried different chargers, but no luck. It’s frustrating given the brand’s reputation. I’m returning it for a refund. Very disappointing experience!
J
Jake Thompson
Reliable Battery for Everyday Use
I'm really happy with the Fenix 18650 battery. I use it in my vape mod, and the 3500mAh capacity keeps me going for days. It charges quickly via USB too, which is nice. Will definitely purchase another one!
WELCOME5: Use code WELCOME5 for 5% off on your first order
