The 6 Most Powerful 21700 Battery Flashlights (Have Light All Night)


Most of the time, people will choose something over the other due to their personal preferences—for example, flashlight batteries. Some may prefer disposable ones, others pick a battery for its mAh, and others choose the 21700 battery.

This battery is putting its competitors out of the market. What for? It’s bulky but fully packed for a looong day ahead.

What are 21700 Batteries?

A 21700 battery, like this one from Fenix Store, is a rechargeable lithium-ion battery primarily used in flashlights. It gets its name from its size: 21mm in diameter and 70mm long. The battery can be either unprotected and protected.

Aside from being used to power flashlights, this battery has a lot of applications. It is said to be Tesla’s choice for their Model 3 mid-size sedan’s power source. Moreover, it is the prime choice of electric bike and vape manufacturers.

Pros and Cons

These batteries have a super-high mAh range, varying from 3000 up to 5000. Higher mAh means a longer-lasting flashlight with a higher capacity for powerful light. The downside? Understandably it’s charging time.

21700 vs. Other Batteries

There are other batteries and chargers out there, especially when you visit Fenix Store. However, why does the 21700 stand out from the others?

For one, it’s a given that you need to use a flashlight that’s compatible with a 21700 battery. Moreover, 21700 flashlights cannot use AA batteries and many can’t use 18650 or CR123 batteries. Another difference is 21700 flashlights give out the same power as larger batteries like the 26650 battery, but 21700 batteries are less bulky. Also, the 21700 battery also delivers a brighter output and can sustain it longer, unlike the 18650 or an AA battery.

Flashlights with 21700 Battery

If you want to get a flashlight with a 21700 battery, I highly recommend browsing through Fenix. You can visit the Fenix Store and browse through their collection of 21700 flashlights. To narrow down your selection, here are some of Fenix’s 21700 flashlights:

1. Fenix PD36R

The PD36R is one of the 21700 flashlights Fenix offers. It has a textured exterior for easy gripping and is portable and lightweight. Fenix specially made this flashlight with sturdy aluminum finishing it off with a hard-anodized finish making it anti-abrasive.

Another great feature of this flashlight is it can hold out against a 5-foot drop and has a waterproof rating of IP68.

This tactical and EDC flashlight can shine up to 928 feet away at its highest setting of 1600 lumens. It has six modes: Turbo, High, Med, Low, Eco, and Strobe. You can switch between them using a side switch. Lastly, when fully charged, you can use its 21700 battery for 2.9 hours (Turbo) up to 115 hours (Eco).

2. Fenix PD40R V2.0

The Fenix PD40R V2.0 is one of the best 21700 flashlights out there. You thought that the PD40R couldn’t get any better? The upgraded V2.0 comes with new features, like the mechanical rotary switch instead of a button. You can easily dial the switch from any mode you need with this added feature.

The flashlight is equipped with five modes: Turbo, High, Mid, Low, and Strobe. It can generate 3000 lumens when you put it in its highest setting and last for about 2.4 hours.

3. Fenix E35 V3.0

Third times the charm, and so is the third version of the Fenix E35. It only measures 4.65 inches and 1.04 inches in diameter, making it lightweight and very compact. Regardless of its size, it packs a maximum of 3000 Lumens, and it can throw light up to 787 feet.

The Fenix E35 V3.0 has six settings (Turbo, High, Med, Low, Eco, and Strobe). It can last for over 50 hours when you use Eco mode.

The E25V3.0 is one of the best 21700 flashlights of Fenix. The flashlight is equipped with an ultra-thin optical lens and a battery-level indicator. It also has an A6061-T6 aluminum body and has an IP68 waterproof rating.

4. Fenix LR35R

Are 3000 Lumens in 21700 flashlights not enough for you? Try the Fenix LR35R on for size. It has 10000 lumens with a beam distance of 1640 feet. You may think that it’s a bulky flashlight, but you guessed wrong. The LR35R is only 5.5 inches in length and 2.03 inches in head diameter. It also offers a wide beam angle on all of its six settings.

You may wonder about the heat it generates with 10000 Lumens, and Fenix got that covered. LR35R has built-in overheat protection to ensure it’s in tiptop shape every use.

5. Fenix TK16 V2.0


If you’re looking for a highly compact tactical flashlight, the Fenix TK16 V2.0 is for you. The flashlight can fit in your pocket without the bulky feeling with less than 6 inches in height. Its multi-layered body is made with aircraft-grade aluminum and has a stainless steel strike bezel topped with tungsten-breaking tips.

It has six settings: Turbo, High, Mid, Low, Eco, and Strobe. Its highest mode will generate 3100 lumens, which reaches up to 380 meters for 2 hours and 40 minutes. It’s also waterproof, and you can put it 2 meters underwater for 30 minutes. It’s suitable for those who are fond of fishing or camping.

The great thing about this version 2.0 is the advanced pulse-frequency transmission system. With this technology, the Fenix TK16 V2.0 has a better anti-interference performance than its predecessor.

6. Fenix TK30

The TK30 is one of the best 21700 flashlights Fenix has to offer. It has three settings (High, Low, Strobe) and has 500 Lumens and runs for 5 hours maximum.

Although it has 500 Lumens, it has a pinpoint beam distance of 1200 meters or almost three-quarters of a mile. It achieves this impressive feat due to its white laser light source. The TK30 is also equipped with overheat protection and a battery level indicator.

Final Words

Whether you’re going to grab one of the 21700 flashlights mentioned or not, it’ll come in handy in the future. 21700 flashlights will surely brighten every dark situation. However, be sure to read the instructions when buying it from any provider.