Name: Fenix ARB-L18-4000U High-Capacity USB Rechargeable 18650 Battery - 4000mAh
Brand: Fenix
SKU: FX-ARBL184000U
Price: 27.95 USD
Availability: InStock

Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery plugged in to charge

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Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery on mossy stone

Several photos showing the different charging options for the Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery

Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery protection circuits

Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery free of lead and mercury

Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery specifications chart

Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery on its side showing its label

The USB-C port of the Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery

Back side of the Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery

Negative contact of the Fenix ARB-L18-4000U high-capacity rechargeable 18650 battery

Two Fenix ARB-L18-4000U high-capacity rechargeable 18650 batteries with built-in USB-C charging ports, predominantly black with orange accents.

$27.95

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The Fenix ARB-L18-4000U High-Capacity 18650 Battery boasts a built-in USB-C charging port and a top-of-the-line 4000mAh rating, ensuring, convenience, top-notch performance, and dependability. With built-in safeguards such as short-circuit prevention and multiple protective layers, along with a button-top design perfect for various Fenix LED flashlights, this rechargeable battery series is the ideal option for superior lighting capabilities. The Built-in USB-C charging ports means that you don't need anything more than a charging cable to get going, not external battery charger needed.

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

THIS BATTERY IS SLIGHTLY LARGER THAN A NORMAL 18650 BATTERY. SEE SPECIFICATIONS FOR DETAILED LIST OF COMPATIBLE PRODUCTS

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.

Fenix ARB-L18-4000UmAh Rechargeable 18650 Battery
Built-in USB Type-C charging port
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.

Compatible models:

TK Series: TK11 TAC/TK11R/TK26R/TK35UE V2.0
PD Series: PD32R
HM Series: HM61R V2.0/HM62-T/HM65R/HM65R-T/HM65R-DT/HM65R-T V2.0/HM75R
CL Series: CL30R
E Series: E28R V2.0
LD Series: LD30R

Fenix ARB-L18-4000U Rechargeable 4000mAh 18650 Battery

Overall rating: 2.2 / 5 from 5 reviews.

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Reviews

Too Large!

"To call this an 18650 battery is disingenuous. It will not work with most of Fenix's OWN PRODUCTS which use the 18650 series power cells! The body is too long and severely limits which pocket sized products you can purchase. Definitely do not recommend."

— Lance (2/5)

Make sure to read dimensions. They are stated in description

"While I knew it was slightly longer I was unsure what my equipment would allow dimensions wise so I bought one of the 4000U batteries to try. They are too long for most flashlights that are not specifically designed for that battery. I ordered these to try in a thermal sight. They are also to long for that but, they do still do a great job of working items they are designed for."

— Dustin M. (4/5)

Too big to be a 18650

"My Fenix flashlight uses this style of "button top" 18650 battery (not the flat variation), but this battery is too long. It is longer than my other Fenix 18650 batteries with button tops. It does not fit my Fenix flashlight. USB-C and 4000mAH sounded good, but it is unusable. Why have a standard battery size if Fenix is going to ignore it? I am disappointed. Otherwise, I am fairly happy with Fenix products or I wouldn't have tried to buy a spare battery."

— Terry D. (1/5)

Too Long

"These batteries are 1-2mm longer than the batteries that came with my Fenix PD35 V3 flashlights. The extra length does not allow the flashlight’s cap to close all the way, so the flashlight won’t turn on. I was able to put these batteries in two other devices and they worked, but I bought these for the PD35s as they only come with 2600mAH batteries. I emailed customer support and I’m waiting to hear back to see how they resolve this issue of essentially defective batteries."

— Curtis S. (1/5)

Make sure your lights are compatible with these

"Good idea with the type c charging on the battery but this 4000U 18650 is slightly taller than normal 18650 batteries and it will not work in some of the fenix and other brands of flashlights that take 18650s."

— Nick (3/5)

Fenix ARB-L18-4000U High-Capacity USB Rechargeable 18650 Battery - 4000mAh