The Power Source: 21700 5000mAh USB-C

The kit includes two 21700 lithium-ion batteries with a rated capacity of 5000mAh. In the current landscape of portable illumination, 21700 cells are the industry standard for high-output tactical lights (like the L35 series). These aren't generic cells; they are engineered to handle the high-drain demands of modern drivers without significant voltage sag.

Crucially, these batteries feature integrated USB-C charging ports. This eliminates the dependency on separate wall chargers or bulky docking stations. When you are operating out of a vehicle or a base camp, you can recharge these cells directly via a power bank or laptop. It simplifies your loadout: fewer cables, less weight, and more redundancy.

The A2 Storage Box: Protection and Utility

Loose batteries rattling around in a cargo pocket are a liability. They risk short-circuiting against keys or tools. The A2 Battery Box solves this by providing a dedicated, impact-resistant housing.

Compact Form Factor: The case is surprisingly compact, roughly the size of the battery itself, making it easy to stash in a pouch or EDC organizer.
Internal Charging: You do not need to remove the batteries to charge them. The case features a pass-through port, allowing you to charge the cells while they remain protected inside.
Status Indicators: The box features LED indicators that provide immediate feedback on charge levels. In a high-stress environment, knowing exactly how much juice you have left without guessing is vital.

Field Application: The Rotation System

For the professional operator or the serious enthusiast, this kit enables a "hot-swap" workflow. You carry one battery in your light, and the spare in the A2 box. When the primary cell depletes, you swap it instantly. The depleted cell goes into the A2 box to be recharged later, or kept safe until you return to base.

Existing reviews

A convenient box

I grabbed this A2 battery kit alongside my new light, and it has honestly been a total game-changer for my setup. Getting two solid 5000mAh 21700 cells right off the bat means I never have to worry about running out of power during longer trips. Having the built-in USB-C ports directly on the batteries is so convenient because I can just charge them off my power bank without dragging a heavy external charger around.
The included A2 storage box is way more useful than I expected, too. It keeps the spare cell totally protected in my pack so I don't have to worry about it shorting against keys or other gear. Being able to plug straight into the box to charge without taking the battery out is a genius touch, and the quick LED status lights mean I always know my charge level at a glance. It makes running a hot-swap rotation so smooth,one cell in the light, one safe in the box, ready to go. If you rely on high-output lights in the field, this little kit is 100% worth picking up.

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A MUST HAVE

Honestly, if you use 21700-powered lights, you need this. It’s super tough, keeps two massive 5000mAh batteries protected from shorting out in your bag, and the USB-C port right on the box means you can charge them anywhere without bringing a bulky charger. Kept me powered up through a whole weekend in the woods without a single headache!

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Perfect combo to never run out of power

With this combo of 2 X 21700 battery and the storage box with built in USB-C charging port you will not run out of power on longer trips. The charging is fast and easy to use die to the indicators. The quality of the battery's and the box is really nice, also the price is very fair, almost a bargain. Can really recommend this product.

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21700 USB-C Rechargeable Batteries Set with A2 Storage Box

The Power Source: 21700 5000mAh USB-C

The A2 Storage Box: Protection and Utility

Field Application: The Rotation System

Existing reviews

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