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Fenix Battery FAQs

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Helping to understand complex batteries.

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Are ARB-L18 and ARB-L2 batteries interchangeable?

The ARB-L18 batteries are upgrades to the ARB-L2 batteries and generally work with most Fenix models that use 18650 batteries. However, the ARB-L18 series are sometimes unable to be used in older Fenix models and the ARB-L2 series are sometimes unabl

Can 14500 lithium-ion batteries be used in most other AA devices?

Check the product listing of whichever item you're interested in to learn more about which batteries are compatible. The product listing will say if it's compatible with a 14500 lithium ion battery and/or an AA battery. Learn more about different bat

Can a 16340 battery be used in place of a CR123A battery?

It depends on which Fenix flashlight you're using. It is important to remember that even if the 16340 and CR123 batteries are of similar size and shape, they are different from one another. Check the product listing of the flashlight you're intereste

Can a USB rechargeable battery be charged in a Fenix USB rechargeable flashlight?

Yes it is possible but we do not recommend it. You can charge a USB rechargeable battery using a USB rechargeable flashlight, but we have seen cases where there was interference between the battery and the flashlight. So we recommend you use a non-US

Can Fenix AA flashlights use Li/FeS2 batteries?

No, these batteries are not recommended in Fenix flashlights. Please check the battery chart located on the product page of the AA flashlight you're interested in to see which batteries are compatible with the flashlight.

Can Fenix chargers charge unprotected 18650 cells?

We can't recommend any of our chargers for an unprotected 18650 battery. All Fenix batteries are protected batteries, so that's all we recommend to our customers. It's a safety feature for a very powerful battery type. Fenix chargers will charge othe

Can I leave my rechargeable flashlight or battery plugged in all the time?

The answer to this question is both yes and no. All Fenix flashlights and Fenix batteries have protection circuits that should prevent any damage to the light or battery that could be caused by overcharging so it is possible to leave it plugged in al

Can I order an extra battery for the Fenix UC40UE?

Yes, the Fenix ARB-L1-2600 is compatible and will charge inside the Fenix UC40UE.

Can I purchase an extra battery for the TK65R?

We do not sell this battery as a standard retail item but if you contact our warranty department you may be able to get an extra one, as stock allows. Please use our Contact Form to submit your request.

Can I safely use the batteries in my Fenix flashlight until they are fully drained?

This depends on the battery that your flashlight is compatible with. If your flashlight is compatible with disposable batteries such as alkaline or lithium, then you can drain the battery completely with no worries. For any lithium-ion battery or rec

Can I use a 3500mAh battery with a 3400mAh battery?

No, it is always best to use batteries that have the same capacity as one another when operating a flashlight that requires more than one battery. The mAh, or milliamp, level of the battery is the indication of its capacity. When a flashlight uses mu

Can I use a Fenix 16340 battery in my older Fenix E15 that was released before 2016?

No, only the 2016 edition Fenix E15 can accept 16340 batteries. Editions older than 2016 are not able to use 16340 batteries. We do have many flashlights that are compatible with 16340 batteries including the Fenix E18R V2 EDC flashlight.

Can I use and recharge Fenix ARB-L14-1600U USB Rechargeable Li-ion 14500 Battery in the RC05 Flashlight?

Yes, you are able to use the Fenix ARB-L14-1600U 14500 battery in the Fenix RC05 pocket flashlight. However, you will not achieve the full brightness output. To get the full brightness output you will need to use the ARB-L14-800 battery.

Can I use another brand's battery at the same time as a Fenix battery?

We do not recommend that you mix battery brands, even if both batteries are listed at the same milliamp level. Even a Fenix 2600 mAh 18650 and a Tenergy 2600 mAh 18650 could have a small difference in the actual usable capacity of the battery, which

Can I use any 18650 battery in my Fenix flashlight?

NOT all 18650 battery brands are the same size (or quality). Fenix lights require 18650 batteries that are 3.6/3.7 volts. That's very important. If you are shopping other brands, then you need to get one that is the same size (length and diameter) as

Can I use Duracell batteries in my Fenix flashlight?

With lithium-ion batteries, we don't recommend using anything other than Fenix batteries. However, you are able to use a Duracell 18650 battery with many Fenix flashlights. With alkaline batteries, we do not recommend using Duracell batteries within

Can I use Energizer batteries in my Fenix light?

Energizer is a reputable brand of batteries and are fully compatible with any Fenix flashlight that uses the size of batteries that Energizer makes!. Please note that, because it is intrinsically safe, the WF05E is only compatible with Energizer E92

Can I use Panasonic li-ion batteries in my Fenix light?

Yes, Panasonic batteries will work in Fenix lights. Check out our battery selection.

Can I use rechargeable RC123A batteries in Fenix lights?

Unfortunately Fenix lights are not able to use the rechargeable CR123A batteries, also called RCR123A batteries. If you want to use rechargeable batteries in your Fenix light you must use 18650 batteries or, in certain cases, 16340 and 14500 batterie

Can I use Samsung batteries in Fenix lights?

Yes, you are able to use Samsung batteries in Fenix lights.

Can I use the ARB-L18-3500U USB rechargeable battery in my Fenix HL60R headlamp?

Yes, the ARB-L18-3500U will work in your headlamp. The built in USB battery is slightly longer due to the button on the top but it should still work just fine. We haven't had any issues reported with those two items.

Can I use UltraFire batteries in my Fenix light?

We do not recommend using UltraFire batteries with Fenix lights. We have not had good results with the quality of those batteries. Feel free to browse our battery selection to see if we have what you're interested in.

Can my Fenix 18650 lithium-ion batteries be left in a below zero storage area for days at a time and still function when the light is needed?

Fenix 18650 batteries can be both stored and used in a range of -4º F to 140ºF. It is important to remember that cold temperatures cause lithium-ion batteries to drain at a quicker pace both while in use and not.

Can the 26650 4500mAh battery be used in the Fenix PD35 TAC flashlight?

No, 26650 batteries are larger than 18650 batteries so 26650 batteries will not fit in an 18650 flashlight like the Fenix PD35TAC. Learn more about the different flashlight battery types.

Can the ARB-L1-2600 work in all Fenix flashlights?

No, the ARB-L1 model is a battery which will only work in a very small amount of lights. The RC20 is the only currently available flashlight that uses this battery but it is also used in several discontinued lights: RC10, RC15, UC40, UC40UE, UC45, an

Can the ARB-L18-3400 battery be charged inside the older Fenix UC30 with a USB cable?

Yes, the Fenix ARB-L18-3400 battery will charge while within the old Fenix UC30 via micro USB.

Can the Fenix 4800 mAh High Quality 26650 battery be used in the New Fenix HL60R headlamp?

No, 26650 batteries are larger than 18650 batteries so Fenix 26650 lithium ion 4800 mAh battery will not fit inside the Fenix HL60R headlamp. Learn more about the difference in flashlight batteries.

Can the Fenix ARB-L18 3500 mAh battery be charged and used in the Fenix CL25R or the CL30R LED Rechargeable Lanterns?

Yes, you can charge and use the Fenix ARB-L18 high-capacity 18650 3500 mAh battery in the Fenix CL25R and CL30R LED camping lanterns.

Can the Fenix ARB-L18-3500U USB batteries be recharged in Fenix chargers?

The Fenix ARB-L18-3500U USB batteries can be charged using the Fenix ARE-X2 Dual Channel Smart Charger AND through micro USB.

Can the Fenix RC11 run on the Fenix ARB-L18-3500U USB rechargeable battery?

Yes, the ARB-L18-3500U battery will work in the Fenix RC11 flashlight.

Can you upgrade the battery included with a flashlight to a battery with higher milliamps?

Fenix flashlights and lanterns with included batteries come pre-packaged and therefore the batteries cannot be exchanged before shipping. You will need to buy these batteries separately in addition to the item. This will grant you backups in case you

Can you use a Fenix ARB-L14-1600U 14500 battery with the Fenix E12 (V1) or E12 V2.0 flashlights?

No, the Fenix E12 (V1) and E12 V2 are not compatible with 14500 batteries. These flashlights are only compatible with AA Ni-MH batteries and AA alkaline batteries. If you're interested, you can see our selection of 14500 flashlights.

Can you use an ARB-L18-3400 18650 battery in the Fenix TK09 flashlight?

Yes, all of our Fenix 18650 batteries are compatible with the Fenix TK09. The main difference will be the mAh capacity. The higher the mAh, the longer the run times will be between charges.

Can you use four CR123A batteries instead of two 18650 batteries in the Fenix TK47 UE?

Yes, you can use four CR123A batteries in the Fenix TK47UE flashlight. However, you will have limited functionality and will not be able to change modes or activate strobe.

Do Fenix 18650 lithium ion batteries work in other non-Fenix devices?

Yes, our Fenix 18650 batteries should work in most devices that use an 18650 battery. It's important to note, that some products prefer flat top 18650 batteries over our button top 18650 batteries.

Do I need to purchase a battery charger for the Fenix PD25's or PD25R's rechargeable battery?

You do not need to purchase a battery charger for either the original PD25 or the newer PD25R. The PD25R includes an ARB-L16-700 rechargeable 16340 battery and can be charged via the flashlight's USB Type-C charging port. The PD25 (discontinued) come

Do Orbtronic batteries work in Fenix flashlights?

For the most part, Orbtronic batteries are NOT compatible with Fenix flashlights. We recommend using Fenix batteries in Fenix lights.

Do the batteries in my rechargeable flashlight have to be charged through the flashlight or can I use a battery charger?

If your light uses a 21700, 18650, or other standard type of battery you can charge the batteries that come inside your Fenix rechargeable flashlight through the flashlight or on a charger. You don't need to specifically charge them using the flashli

Do the Fenix USB rechargeable batteries come with a charging cable?

No, the USB rechargeable batteries do not come with charging cables. However, you can purchase charging cables.

Do you have 18350 batteries?

No, we do not have 18350 batteries but we do have a wide selection of batteries which you can view here.

Do you have a protective storage case for 14500 batteries?

We do not have protective cases for 14500 batteries, but we do have other battery storage options.

Do you have a storage case for 26650 batteries?

No, we do not have any storage cases for 26650 batteries. Browse our other battery storage options. This information may change in the future.

Do you have Fenix 18650 batteries with a built-in micro USB charging port?

We do have USB rechargeable 18650 batteries. Check out our battery section to see which battery you'd like. The ones that have a built-in USB port end with the letter "U" (ARB-L18-3500U for example).

We do not carry AAAA batteries. We do carry AAA batteries, but they are not USB rechargeable. If you're interested in learning more about batteries, check out our blog where we cover different battery types. Did this answer your question? Last up

We do not carry AAAA batteries. We do carry AAA batteries, but they are not USB rechargeable. If you're interested in learning more about batteries, check out our blog where we cover different battery types.

Do you sell high quality rechargeable AAA and AA batteries?

Yes, we have high quality rechargeable AA and AAA batteries. For AA batteries we have two options of Tenergy batteries to choose from. One is a Ni-MH four pack of Tenergy AA batteries with a 2600 mAh capacity. The other is a Ni-MH Low Self-Discharge

Do you sell rechargeable CR123A lithium batteries?

No, we do not sell rechargeable CR123A lithium batteries because they are not compatible with Fenix lights. You can find more information about which batteries your Fenix flashlight is compatible with by checking its product page or user manual. You

Do your lithium ion batteries come fully charged?

The lithium-ion batteries and Ni-MH batteries are fully charged when they leave the factory, but they slowly drain while in storage. We recommend topping the batteries off by charging them when you receive them. Learn more about different battery typ

Do your Ni-MH rechargeable batteries come fully charged?

The lithium-ion batteries and Ni-MH batteries are fully charged when they leave the factory, but they slowly drain while in storage. We recommend topping the batteries off by charging them when you receive them. Learn more about different battery typ

How big are the Fenix 14500 batteries?

The dimensions of the ARB-L14 USB 14500 battery (ARB-L14-1600U) are 14.5mm x 50mm (.57" x 1.9").

How big are the Fenix 16340 batteries?

The size of the USB rechargeable ARB-L16 "U" battery, the ARB-L16-700U, is 16mm x 34mm (.6" x 1.3"). The size of the USB rechargeable ARB-L16 "U Plus" battery, the ARB-L16-700UP, is 16.8mm x 35.5mm (.66" x 1.4")

How big are the Fenix 18650 batteries?

The dimensions of the standard ARB-L18 series 18650 batteries (ARB-L18-2600, ARB-L18-2900, and ARB-L18-3500) are 18.6mm x 69mm (.7" x 2.7"). The dimensions of the USB rechargeable ARB-L18 "U" series 18650 batteries (ARB-L18-2600U and ARB-L18-2900U) a

How big are the Fenix 21700 batteries?

The dimensions of the Fenix ARB-L21 series 21700 battery is 76mm x 21.5mm (.85" x 2.99"). The Fenix 21700 lithium-ion battery is a powerful and protected cell. It's compatible with many flashlights such as the Fenix PD36R.

How big are the Fenix 26650 batteries

The dimensions of the ARB-L4-4800 26650 battery is 26.5mm x 70.5mm (1.05" x 2.78").

How can I tell if my battery is fully charged?

If you have a USB rechargeable lithium-ion battery, the indicator will glow solid blue once it's fully charged. If you have a Fenix battery charger with an LCD screen, the display will show you when the battery is full. If you have a Fenix battery ch

How can I tell when my Fenix USB rechargeable battery is fully charged?

On the micro USB rechargeable batteries, there will be a small LED on top of the battery. It will be red while it is charging and, once it is done, the red LED will be replaced by a blue LED.

How do I know when my battery is finished charging?

All Fenix products that charge batteries have a pretty clear way to tell when the battery is full!

How long do Fenix batteries last?

All removable Fenix batteries carry a 1-year warranty that protects the purchaser from any battery failure in that time period. Batteries that are built-in (like those inside the BC30R or HL32R) are covered for 2 years. Even outside of the warranty p

How long do rechargeable lithium ion batteries last?

With proper upkeep, rechargeable lithium ion batteries should last for around 500 charge cycles. However, this can fluctuate depending on the type of climate and use. Learn more about batteries.

How long does it take for an ARB-L18-3500U battery to charge via cable?

The charging process will probably take 4-8 hours from a fully dead battery.

How long does it take to charge a Fenix battery in a Fenix charger?

This depends on the battery you are charging as well as the battery's capacity. For example, an 18650 battery with a 3500mAh capacity will take longer than an 18650 battery with a 2600mAh capacity. These times we provide below are general charge time

How long does it take to fully charge a Fenix ARB-L18-3500U battery using its USB charging function?

To fully charge the Fenix ARB-L18-3500U battery using its USB charging function, it would take 3 - 5 hours depending on the status of the battery.

How long of a runtime will I see with the Fenix ARB-L18-3500 18650 battery versus the ARB-L18-2600 18650 battery?

From the 2600mAh to the 3500mAh battery, you will get an ESTIMATED 30% longer runtime between charges with the 3500 battery. As with all batteries, the environment temperature affects the run time of the battery. 18650 batteries won't operate in belo

How much longer would a Fenix flashlight run if I were to use an 18650 3500mAh battery vs an 18650 2600mAh battery?

The flashlight's runtime would increase about 30% if you were to use the 3500mAh Fenix 18650 battery rather than the 2600mAh Fenix 18650 battery.

How would you compare the performance of the Ni-MH 1.2V battery and the lithium 1.5V battery?

A 1.2 V battery will result in the same operation as the 1.5 V battery because the level of amps is different and that is the most important part. They will even out in the end so the runtime will be comparable with either. To learn more about batter

Is the Fenix ARB-L1-2600 battery a replacement for the ARB-L1T or ARB-L1S?

Yes, the ARB-L1-2600 is a replacement for both the ARB-L1T and ARB-L1S.

Is the price listed for the Fenix ARB-L18-3500 18650 battery for a single battery or a two pack?

For the ARB-L18-3500 18650 battery, we have both a single battery listing and a 2-pack battery listing for your convenience. The price per battery is the same with both listings. Check the title of the product listing; the 2-pack 18650 batteries will

Is there a recommended storage voltage for 18650 rechargeable batteries?

When it comes to storing 18650 batteries, there are a few things to keep in mind. 18650 batteries drain with time so you'll want to recharge them about once a month to be sure they have a full charge when you need them. When you receive a Fenix batte

Is there a way to fix an overdischarged battery in deep discharge?

Sometimes putting an overdischarged battery in a charger can give it a "jump" and fix it, but this doesn't always work.

My Fenix battery is starting to peel and swell after charging. Is this normal?

No, this is not normal for any battery to do. Please contact our warranty department by submitting this RA request form and we'll be happy to assist you.

My unit's USB port is not working. Is it covered under warranty?

Yes, in the majority of cases a defective USB port would be covered under warranty. The only exception to this would be if you are responsible for the USB port breaking by incorrectly inserting the cable or by allowing it to be compromised by dust or

Should I discharge an 18650 battery before charging it?

We recommend that you NEVER fully discharge any lithium-ion batteries. By not fully discharging it, you help improve the battery life. If a lithium-ion battery is used until it is completely empty it can enter a state of deep-discharge which can prev

The plastic wrapping on my Fenix lithium-ion battery has started to tear. Is it still safe to use?

Any amount of tear in the plastic wrapping can make the battery unsafe. We recommend that you stop using the damaged battery and replace it.

What are the advantages and disadvantages of using a micro USB rechargeable lithium-ion battery versus a rechargeable lithium-ion battery that requires a battery charger?

One advantage of the micro USB rechargeable lithium-ion batteries is that you do not need to purchase a separate charger for these batteries. However, they are a little bit longer and don't work with all Fenix flashlights such as the Fenix PD35 V2.0.

What are the charging requirements for batteries with charging ports?

Fenix Direct Charge batteries can only charge under certain parameters,  We recommend using a single port charger that is around 2 Amps with no more than 10 watts max. Most multi port chargers will not work, this includes computer ports. This is due

What are the pros and cons of 18650 lithium-ion batteries?

18650 lithium-ion batteries will often provide you with more power and longer runtimes in the flashlight. They're also rechargeable which is a definite bonus. However, lithium-ion batteries do drain slowly over time and tend to be more costly than an

What batteries can be charged inside USB rechargeable flashlights?

Each flashlight can only charge the primary battery that they use. For a flashlight that uses and comes with an 18650 battery, it will be able to charge the 18650 battery. Many of these lights can also use CR123A batteries but CR123A batteries cannot

What batteries should I use for the Fenix PD35TAC tactical flashlight?

Any Fenix 18650 battery will work well in Fenix PD35TAC tactical flashlight. The higher mAh the battery has, the longer runtimes you'll see with the LED flashlight. Please be aware that whatever 18650 battery you choose needs to be a button top batte

What batteries should I use in my Fenix light?

Fenix flashlights are compatible with many different brands of batteries. Different flashlights call for different battery types and not all battery manufacturers make all types of batteries!. Energizer: You can use any Energizer AA or AAA battery in

What does the Limited Lifetime Warranty Cover?

All Fenix flashlights are covered under a Limited Lifetime Warranty. "Limited" refers to the fact that the warranty has a full-coverage warranty for a set period of time where both parts and labor are covered and then a limited warranty after that fo

What does the mAh mean in lithium-ion batteries?

The mAh stands for "milliamp." The mAh is basically the capacity of the battery so the higher the number of mAh, the longer the runtime will be before having to recharge your batteries. It's important to make sure you're using the correct size lithiu

What is a protected battery?

Fenix protected batteries feature three levels of over heat protection as well as over discharge protection, over charge protection, and short circuit protection. Learn more about the protected and unprotected batteries.

What is the best AA flashlight?

"The Best" flashlight can vary a lot depending on what you need it for or what you plan to use it for!. The brightest AA flashlight that we have is the Fenix LD41 which has an output of 960 lumens. But it takes 4 batteries and is rather large, so it

What is the difference between the ARB-L18-2600 and the ARB-L18-3500 batteries?

The difference between these two batteries is their capacity. The ARB-L18-2600 18650 battery has a 2600 mAh capacity whereas the ARB-L18-3500 battery has a 3500 mAh capacity. The higher the capacity, the better runtimes you'll see with the flashlight

What is the difference between the Fenix ARB-L2M batteries and the ARB-L18 batteries?

The Fenix ARB-L18 series have replaced the ARB-L2M batteries which are now discontinued. The ARB-L18 batteries work with almost all Fenix flashlights that were compatible with the ARB-L2M batteries.

What is the max discharge amperage of the Fenix ARB-L18-3500 18650 battery?

The maximum discharge current of the Fenix ARB-L18-3500 18650 battery is 5A.

What's the difference between a $5 18650 battery and a Fenix battery?

Most low-priced batteries are NOT protected, we would caution you against using those. As you know, 18650 Lithium-Ion batteries are very powerful.  Because of that, you should be aware of the safe handling of them. Don't look just at the price of the

When do I need to replace rechargeable lithium ion batteries?

There is no need to replace 18650 batteries after a set period of time. They can continue to be used until they stop working or until they no longer offer the runtimes that you need. Learn more about lithium-ion batteries.

Where are Fenix brand flashlights manufactured?

Fenix is manufactured in China and we are an Official Distributor for them here in the United States.

Where can I purchase the Fenix ARB-L2 series batteries?

The Fenix ARB-L2 series has been discontinued and replaced with the ARB-L18 series. You can find the ARB-L18-2600, the ARB-L18-2900, and the ARB-L18-3500.

Which 18650 batteries replaced the ARB-L2 series?

The ARB-L2 series was replaced by the ARB-L18 series which you can find here.

Which battery is better for extremely cold weather: 18650 lithium-ion batteries or CR123A lithium batteries?

CR123A batteries perform better in extreme cold and extreme heat than 18650 lithium ion batteries. However, 18650 batteries will still work in extreme temperatures in a range of -4ºF to 140ºF. CR123A batteries are able to operate in temperatures betw

Which Fenix flashlights can use the ARB-L18-2900L cold-resistant battery?

Any Fenix flashlight that uses 18650 batteries will work with the ARB-L18-2900L.

Who manufactures the Fenix lithium-ion batteries?

The manufacturer is Fenix themselves based in China. Each battery from Fenix has a multiple protection design to ensure safety. For instance, there is the protection circuit in the anode that will protect against over charge, over discharge, short ci

Will a 16340 make my CR123A light brighter?

This is a bit of a complicated question and the answer is both yes and no, depending on the model of flashlight that you have. Newer Fenix flashlights like the PD25, CL09, or RC09 are designed to be compatible with both CR123A batteries or with 16340

Will button top 18650 batteries work in Fenix lights?

In general, most Fenix flashlights are compatible with a button-top 18650 battery but some older models may require a flat top battery. Just to be safe, assume that any Fenix light that was released after 2017 will require a button top battery and th

Will flat top 18650 batteries work in Fenix lights?

Most modern Fenix flashlights will require a button-top style 18650 battery but some older styles may not be compatible. As a general rule, assume that any light that came out after 2017 will require a button top battery and that any lights that came

Will the ARE-X2 charge a 21700 battery?

Here are our list of battery chargers that will charge a 21700 battery:. Fenix ARE-A2. Fenix ARE-A4. Fenix ARE-C1+ (discontinued). Fenix ARE-C2+ (discontinued)

Will the Fenix ARBL18 High-Capacity 18650 Battery - 3500mAh fit my HL60R headlamp?

Yes, the Fenix HL60R headlamp is compatible with the ARB-L18-3500 18650 battery. The HL60R headlamp is compatible with 18650 batteries and CR123A batteries.

Would a standard non-Fenix AA charger charge Fenix 14500 lithium-ion batteries?

This depends on the charger you are using. As long as the manual on your charger states that it can charge 14500 batteries, then the Fenix 14500 batteries should charge just fine.