The Best Flashlight Batteries of 2022

You'll always want your flashlight's batteries to be fresh so that it doesn't drain fast when you need them. However, dealing with the inconvenience and expense of replacing batteries regularly can be a hassle.

If you're looking for the best rechargeable batteries for your flashlights, you're in luck. Fenix provides effective batteries for electronic gadgets such as flashlights and security cameras. Their store sells high-capacity rechargeable 18650, 21700, and 16340 batteries which we will be reviewing today.

What to Consider

When choosing a flashlight, think about the type of battery you want to put in it. These can be throw-away, rechargeable, Ni-MH, Li-ion, lithium, etc. Also, consider factors such as the temperature of the place where you will be using the flashlight.

However, not all batteries are made to withstand extreme temperatures. You don't want to buy a lantern or headlamp for your next Arctic adventure only to discover it won't work when you get there.

The majority of Fenix rechargeable batteries are intended for use in flashlights and other similar electronic devices.

  • Fenix ARB-L18 Series 3500mAH 18650 Rechargeable Battery
  • Fenix Rechargeable 21700 Li-ion Battery - 5000 mAh
  • Fenix ARB-L16 Series 700mAH 16340 Rechargeable Battery
  • Fenix Non-rechargeable CR123 lithium-ion battery

Now, let's review these batteries more thoroughly to help you decide which you should get.

Fenix 18650

I consider this one of the best for it is regarded as the top-of-the-line Fenix battery, with a massive 3500mAh capacity. In addition, Fenix has incorporated measures to avoid short circuits and designed numerous layers of protection into this new Fenix 18650 battery.

The new 18650 series better accepts a variety of flashlight manufacturers with its updated button-top design. In addition, these batteries are rechargeable, have a long battery life, and can manage the power requirements of sophisticated LED torches, which I found ideal for strong Fenix LED flashlights.

To prevent the cell from expanding and exploding, vents incorporated inside the battery evacuate gas generated by internal short circuits. I found it even more interesting since the Fenix 18650 is protected against impact by a steel shell as an additional safety feature.

This long-lasting battery is also designed to survive up to 500 charge/discharge cycles, with a low self-discharge rate that allows it to retain up to 75% of its capacity after the final cycle. In addition, the 18650 li-ion cells will not lose functional capacity if they are repeatedly charged after being just half drained because they have no memory effect.

Fenix 21700

I also consider this one of the best, primarily because the built-in USB-C charging connector distinguishes this Fenix 21700 battery from other 21700 batteries. This charging connector enables lightning-fast charging, allowing you to charge it less than 4 hours.

We won't need to buy a separate charger because there's an integrated charging connector!

This Fenix 21700 has 3.6 volts of power and a 5000mAh capacity and PTC and PCB protections, ensuring long runtimes and use.

The three levels of overheat protection ensure that the battery stays cool when powering your favorite flashlight. I must say that this 21700 battery is the ideal companion for any 21700-compatible flashlight, thanks to its built-in protective mechanisms and USB-C charging connector.

I like how the Fenix ARB-L21-5000 is a high-capacity battery that can run 21700 high-drain devices, including flashlights, lanterns, and other gadgets.

It goes great with the Fenix PD36R spotlights! I must add that Fenix 21700 has all of the features you'd expect from a high-end Fenix battery, including protective circuits inside the anode and up to 500 charging cycles.

Fenix 16340

This next top battery I will discuss has just been upgraded! The Fenix 16340 is a high-capacity 16340, 700 mAh lithium-ion battery designed exclusively for high-intensity light use and is the appropriate companion for all existing Fenix 16340 (RCR123) powered lights.

Also, the anode has a protective circuit built into it, which is protected by a riveted steel hat. Because the steel casing completely covers the battery, the risk of short-circuiting due to collision or impact is significantly reduced.

In addition to charging in a battery charger (Fenix charger suggested), I found it interesting that the Fenix 16340 has a built-in micro USB charging connection on the top of the battery, distinguishing it from ordinary 16340 batteries.

This battery can be charged using a regular Micro USB charging cable, which is easy to get and saves money over buying a separate charger. A charge indicator will illuminate red when the charging cable is plugged in and connected to electricity, and it will turn blue when charging is complete.

Fenix CR123

CR123A Batteries are also one of the greatest options! I suggest that the best site to get CR123 batteries is They sell them alone and in 10-packs!

Most merchants' prices for CR123A batteries are higher than the Fenix store, so I highly recommend this one. Also, most Fenix flashlights that use 18650 batteries can use these non-rechargeable batteries.

The size of two CR123 batteries is the same as one rechargeable 18650 battery. So when camping, trekking, or even caving, CR123 batteries can be used as a non-rechargeable replacement for 18650 batteries. When you're ready to charge your 18650 battery, make sure you have a 10 pack of CR123A batteries on hand.

These large-capacity batteries power flashlights (LED or incandescent), cameras, and other electronic devices for extended periods. PTC protection (threshold of 5 amps) is included in these batteries, preventing excessive discharge that could break lithium cells.

Final Thoughts

I'm glad to present details about the best batteries you can use for your devices at home and for other purposes this 2022. Hoping that I provided helpful information, check out Fenix Store and look through all your preferred products.

They make sure to serve you quality products at reasonable prices. So dive into their website and add your preferred flashlights and flashlight batteries.