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The ARB-L21-6000 is a high-capacity 21700 Li-ion rechargeable battery engineered to deliver exceptional power and extended runtimes for your devices. With a massive 6000mAh capacity and a 10A maximum output, this battery ensures your gear stays powered up for longer, even under demanding conditions. Built-in protection circuitry prevents short circuits, overcharging, and overheating, while pressure relief vents ensure added safety. Even after 500 charge cycles, this robust battery maintains 75% of its original capacity, guaranteeing reliable power for years to come.
Please note that the ARB-L21-6000 battery does NOT have the capability of being used as a power bank. The power bank capability is ONLY available in the ARB-L21-6000B battery
This battery is NOT compatible with lights that use an 18650 battery, and older chargers including the Fenix ARE-A2, ARE-A4 and ARE-X1 2.0. It is compatible with the Fenix ARE-D1 and ARE-D2 chargers.
Additionally, this battery is NOT compatible with the Fenix E35R purchased prior to 2025.
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 >>
Please note that the ARB-L21-6000 battery does NOT have the capability of being used as a power bank. The power bank capability is ONLY available in the ARB-L21-6000B.
Overall rating: 4.6904764 / 5 from 42 reviews.
Review topics: ["battery","capacity","upgrade","service","charger"].
"The first battery I ordered had to be returned because it didn't have tge usb-c port. I would recommend that you call the battery 6000C vs the current 6000B designation. Or even 6000 usbC. That would make it a lot more obvious for the uninformed buyer. The ability to charge the battery directly is a game changer."
— Scott B. (5/5)
"replaced a couple of my 5000mah batteries with these 6000mah 21700's significant improvement in overall run time."
— Robert B. (5/5)
"After a month of testing, this Fenix 6000mAh battery has quickly upgraded from a backup to my primary choice for my high-drain flashlight. Its massive capacity keeps the light on high mode significantly longer than the stock battery, and it easily handles intensive turbo bursts with rock-solid reliability. Even after weeks of sitting idle in a gear bag, it holds its charge perfectly with no self-discharge, and it continues to charge back to full capacity like new. Ultimately, it is worth every penny for anyone seeking maximum runtime and complete peace of mind on the go."
— Dave (5/5)
"I was greatly disappointed that fenix's best battery does not work in their flashlight and headlamp so I have to run two different batteries when i should be able to use the best battery in both my weapon light and my headband."
— Andrew R. (3/5)
"Works perfectly with my bike light. Satisfied."
— Rob B. (5/5)
"These battery are the best, they last so long after full charge. Great product!!"
— Don F. (5/5)
"Great rechargeable battery"
— Joseph C. (5/5)
"Huge capacity. I use this in CL27R lantern and it works great."
— Leithen (5/5)
"The batteries arrived with a small amount of charge and took over 12 hours to fully charge but they seem to be doing alright."
— Gene M. (5/5)
"I use this battery in a PD40R flashlight. I would typically use this light inside very dark power generating plants while inspecting equipment, so long battery life is critical."
— Robert A. (5/5)
Your ExpertVoice deal.
$[Deal Price]
$[Original Price]
Discount applied at checkout.
On sale now — lower than your ExpertVoice discount.
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You’ll see your ExpertVoice discount at checkout.
