Flashlight Batteries
Fenix Flashlight & Device Batteries
The right battery makes the difference between a flashlight that performs and one that disappoints. Fenix carries high-capacity rechargeable batteries and USB charging cables built specifically for flashlights, headlamps, and lanterns — along with CR123A lithium batteries for devices that use non-rechargeable cells.
Rechargeable 18650 Batteries
The 18650 is the most common rechargeable battery size in high-performance flashlights and headlamps, offering strong capacity and long runtime in a compact cell. We carry both standard and USB-rechargeable 18650 batteries, so you can charge directly in the cell without a separate charger.
CR123A & Other Battery Sizes
Beyond 18650, we stock 21700 batteries for high-output lights, 16340 batteries for compact EDC flashlights, 14500 batteries sized like standard AA cells, and non-rechargeable CR123A lithium batteries for devices built around that format.
Chargers & Charging Cables
Keep your batteries topped off with Micro-USB, USB-C, and magnetic USB charging cables built for Fenix rechargeable batteries and lights.
Choosing the Right Battery
Battery size and type depend on your specific flashlight or headlamp model — using the wrong size can damage the device or simply won't fit. Check your light's included manual, or see our Accessory Compatibility Chart to confirm which battery your model takes before ordering.
Frequently Asked Questions
How do I know what size battery my flashlight needs?
Check the specs on your flashlight's product page or manual — most Fenix lights are built around a single battery size (commonly 18650, 21700, 16340, or CR123A) and won't accept others.
Can I use a regular alkaline battery instead of a rechargeable one?
Some Fenix lights accept CR123A or AA batteries as an alternative, but most high-output models are designed specifically around rechargeable lithium-ion cells for full performance.
Are Fenix batteries compatible with other flashlight brands?
Standard sizes like 18650 and CR123A are generally compatible across brands, but always check voltage and dimensions — flat-top vs. button-top cells especially — before use in a non-Fenix device.