Fenix ARB-L21-4000P Rechargeable 21700 Battery

Fenix ARB-L21-4000P Rechargeable 21700 Battery

Marsoni

M251S

$27.95

Get it in 3 business days with 1 day shipping. Friday, May 29

Fenix ARB-L21-4000P Rechargeable 21700 BatteryThe ARB L21 4000P battery supports large current output making it ideal for powering lights and other items that are operated at higher power loads. The maximum current for the ARB L21 4000P is 18A, with a continuous output current of 10A. The higher current allows the 21700 battery longer runtimes at higher levels in flashlights. As with all Fenix rechargeable batteries, the 21700 4000 mAH has three sets of overheat protection, including pressure

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It like a very dark chocolate brown/black. What I liked most about it is that you just pull it out of the box take the long plastic film off of it and it's ready to go. It has protective feet on the bottom. It's very attractive and it was so easy. It's so nice when you have a product you don't have to assemble.

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Reviewed in the United States on May 13, 2026