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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I love this black backpack. It has gold zippers and brown accents and it has a pocket in the front two on the side three inside and a pocket on the back of the laptop pocket. I have a disability and have to carry extra stuff so this is a perfect size for me to wear in my back every day. It’s black nylon so it should stay clean. I tend to drop things. I think this will be great, but even without a disability, this is a great backpack. It’s so cute.

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Reviewed in the United States on October 7, 2025

Verified Purchase

Rachel Fitzpatrick

Charlottesville, US

★★★★★ 5

Perfect day bag!

Color: Upgrade-black, Size: 15.6 Inch

Super convenient and lightweight. I used it for two back-to-back conferences last week and it was PERFECT for what I needed to tote along all day. Fits my regular sized computer (15-16 inch) and even held my water bottle (which is larger than a regular plastic water bottle).

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Reviewed in the United States on February 27, 2026

Verified Purchase

L. Casillas

Louisville, US

★★★★★ 5

Great backpack

Color: Upgrade-black, Size: 15.6 Inch

Stylish and lightweight for travel and work. Sturdy, comfortable straps. After trying about 5 different backpacks, I’m keeping this one.

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Reviewed in the United States on May 25, 2026

Verified Purchase

Kana M. Golic

San Leandro, US

★★★★★ 5

Stylish, light (laptop, phone, notebook & pen) +

Color: Upgrade-apricot, Size: 15.6 Inch, Color: Upgrade-apricot, Size: 15.6 Inch

Perfect for work! I use it for laptop, charger and few items necessary at work. I have a few blocks to walk from parking to work location and this bag has replaced last backpack and purse. Much easier to carry one item than two or more. Plus, it has enough room if you need to use it for clothes and toiletries (road-trip) or carry-on.

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Reviewed in the United States on February 12, 2026