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Batteries

Genuine Fenix rechargeable batteries — 16340, 18650, and 21700 high-output cells matched to your light. Shipped from Mississauga by an official Canadian Fenix distributor, with full Canadian warranty service.

The right cell for your light

Fenix lights are tuned around a specific cell size and current rating, so matching the battery to the light is what delivers the rated output and runtime. The size — 16340, 18650, or 21700 — is listed on each light's product page. Our battery guide explains the sizes and what the numbers mean in plain terms.

Rechargeable versus primary

High-output rechargeable lithium-ion cells cost less over time and perform better in the cold than disposable alkalines. Many Fenix lights also accept CR123A or AA primaries as a backup, which hold a charge for years and are worth keeping in a kit. More on the trade-off in why a rechargeable light is worth it.

Care and cold weather

For long storage, keep cells at around half charge and at room temperature rather than in a cold garage. In winter, a spare kept warm in a pocket keeps output up. Charge with a matched Fenix charger rather than a generic unit — the battery guide has the full routine.

Frequently asked questions

Which battery fits my Fenix light?

Check the product page for your light — it lists the required cell size, such as 16340, 18650, or 21700, along with any minimum current rating. Using the matched cell is what delivers the output and runtime the light is rated for.

Rechargeable lithium-ion or CR123A primaries?

Rechargeable cells are cheaper over time and stronger in the cold, so they are the everyday choice. CR123A primaries hold their charge for years with no self-discharge, which makes them a good backup for storage, travel, and emergency kits.

How should I store batteries over winter?

Store lithium-ion cells at roughly half charge and at room temperature, not in a freezing garage or vehicle. Keep terminals clean and avoid full discharge in storage. The battery guide covers cold-weather and long-term storage in detail.

How do I charge them?

Use a matched Fenix charger, or charge in-light over USB-C on models that support it. Avoid generic chargers that do not manage voltage per cell, since those shorten battery life and can be unsafe with high-output cells.

Are these genuine Fenix cells?

Yes. As an official Canadian Fenix distributor, we stock genuine Fenix cells built to the current rating your lights expect. Counterfeit high-output cells are a real problem online, which is why matched, genuine batteries matter.