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A black Fenix ALF-18 battery adapter designed to convert 18650 batteries to fit 21700 flashlights.

Fenix Store

4.5 (123)

Fenix ALF-18 Battery Adapter

Name: Fenix Store Fenix ALF-18 Battery Adapter - Fenix ALF-18 Battery Adapter
Brand: Fenix Store
SKU: 44858590200104
Price: 5.95 USD
Availability: InStock
Rating: 4.8182 (7 reviews)

4.5 (1,234)

Sold 100+ last 30 days

20% off first order

$5.95

Quantity

Color

Black

Quantity

Description

Want to use your rechargeable 18650 batteries in your 21700 flashlights? No problem, with the ALF-18 Battery holder. Slide your 18650 battery inside the ALF-18 battery holder sleeve, and your battery will now be the size of a 21700, so you ...

Reviews

4.8

11 ratings

Nice fit

Quy · January 21, 2026

Fenix product review

Purchased for my husband after replacing his stolen fenix light. The light I purchased was not the same battery size so the adapter made it easy for him to use the batteries he already had.

Stacy · September 8, 2025

Great gift item with great battery options

Excellent. In case of lost special battery, or charging time, the 18650s are common and I already have a lot of 123s and 18650s.

Michael · January 3, 2025

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Returns accepted within 30 days

Exclusive offer available

Fenix Store

4.7 (5.6K)

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Description

Reviews

4.8

11 ratings

Nice fit

Quy · January 21, 2026

Fenix product review

Purchased for my husband after replacing his stolen fenix light. The light I purchased was not the same battery size so the adapter made it easy for him to use the batteries he already had.

Stacy · September 8, 2025