Are Fenix Batteries Good?

If you are looking for rechargeable batteries or batteries in general, Fenix is the perfect place for you! Fenix sells batteries that fit electronic devices such as cameras for security purposes and handheld flashlights. You can select from an array of various Fenix batteries.

Fenix batteries are high-capacity rechargeable batteries that range from 18650 batteries, 16340 batteries, 14500 batteries, and 21700 batteries. Customers can also opt to purchase Fenix Flashlights that go perfectly with their Fenix batteries.

You can quickly look at the list of available Fenix batteries through their website at and purchase what you need. The batteries that you will see are the same as the batteries found in a Battery Plus store. The batteries on the website are from a USA Fenix distributor.

Fenix Batteries

When using electronic devices, we need to know which batteries operate best. If we want our devices to last longer, it is wise to choose high-quality batteries.

Various types of batteries are available on the market with accompanying limits for their use. Fenix offers quality batteries you can choose from for your devices.

It is of utmost importance to be familiar with the different types of batteries to determine which one you need. Batteries can range from non-rechargeable, throw-away batteries like alkaline and lithium to 18650 rechargeable batteries and 26650 rechargeable batteries. They can also be made of Nickel Metal Hydride (NiMH), Nickel Cadmium (NiCad), or Lithium-Ion (Li-Ion), among many others.

High Tech Power Perfect for High Tech Devices

Fenix offers lithium-ion 18650's for high-drain devices with Tenergy 18650's and CR123's leading in the market. Batteries made of Lithium and Lithium-Ion are considered advanced power sources.

Most vehicles and electronic devices such as laptops and cell phones utilize this source since they are reliable with high efficiency and excellent performance rates.

Chargers for Lithium-Ion Batteries

Some people prefer rechargeable batteries in place of non-rechargeable ones to reduce waste and save time rather than purchasing new batteries when their batteries get worn out. Moreover, rechargeable cells are cost-effective.

Fenix offers advanced battery chargers for lithium-ion cells. People who opt for rechargeable batteries can opt for these safe and effective Fenix chargers. With these chargers, you can expect intuitive displays that can easily be read.

Can You Overcharge 18650 Batteries?

Many 18650 batteries consist of a steel case that offers poor protection and may increase the internal pressure in overcharging cases. With lithium-ion batteries, some main concerns include a short circuit, increasing temperature, or changes in the shape of the battery that may ultimately lead to explosions.

In general, 18650 batteries that explode are inferior. Lithium batteries can explode if they are made of poor quality, thus increasing the chances of internal short circuits while being used.

These internal short circuits create high-pressure gas and a high temperature that cannot be resolved quickly by the exhaust valve release. Advancement in technology improved the 18650 battery preparation process over the last three decades.

The safety valve that has been incorporated at the top of 18650 batteries prevents the occurrence of explosions in the sealed metal enclosure. It serves as a great protection barrier by opening the exhaust decompression when the battery's internal pressure increases excessively.

There is still a possibility that some chemical substances might leak into the battery reacting with oxygen in the air under situations of high temperature leading to a fire. Most 18650 batteries have protection boards accompanied by over-discharge, overcharge, short circuit protection, and other functions to promote safety.

If you have to cut costs, it’s better to buy a cheaper low-quality flashlight than it would be to purchase a low-quality battery. Protected batteries can prevent over-discharging, over-charging, and overheating through their built-in safety features.

What's the Highest mAh 18650?

The maximum capacity of a 18650 battery could reach up to 3500mAh - 3600mAh from the NCR18650G that clocks in at that range. The 3500mAh LG MJ1 is a high-capacity cell that is readily available in the market.

Fenix offers the next generation of 18650 batteries with a 3500mAh rating.

Fenix continuously improves its focus on batteries, with safety as its top priority. The ARB-L18-3500mAh 18650 Fenix battery contains various layers with safety features to avoid short circuits. The button-top design is also compatible with more brands or flashlights aside from Fenix Flashlights.

These Fenix 18650 batteries are perfect for rechargeable Fenix flashlights that have longer runtimes and feature higher outputs. Here, we listed the various specifications and inclusions of the 18650 battery with a 3500mAh rating from Fenix.


  • Fenix ARB-L18-3500mAh Rechargeable 18650 Battery
  • Short-circuit protection designed with a button-top
  • Protection circuit located 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 the internal short circuit
  • Over-charge protection and over-discharge protection
  • Overheating protection
  • 500 Charge Cycles: A properly maintained ARB-L18 battery is designed to retain 75% of its original capacity at 500 complete charge and discharge cycles


  • One ARB-L18-3500mAh High Capacity rechargeable 18650 battery

Final Thoughts

Fenix offers protected batteries with three levels of protection built inside them. It is crucial to store your batteries safely when it is not in use or located inside an electronic device. It is recommendable to keep your batteries in an area that is dry and clean with its ends not touching the opposite poles.

For better safety precautions, check your stored and in-use batteries for the presence of bulges, signs of degradation, and tears on the wrapping. It is also essential to observe the appropriate disposal of batteries in cases of battery failure.