The Milwaukee 48-59-1804 M18 and M12 Gangbox Rapid Charger is a four-bay battery charger built for commercial jobsites where batteries live inside gangboxes, steel boxes, and shared storage. This is a battery charger designed for charging Milwaukee M18 and M12 batteries in gangboxes and other steel storage spaces. Model Number: 48-59-1804. If your crew runs both battery platforms and you need a cleaner, faster charging setup than a loose charger sitting on a shelf, this is the right kind of tool for the job.

What separates this charger from a standard bench charger is the way it handles real jobsite workflow. It has two M18-only bays and two hybrid bays that accept either M18 or M12 batteries, so one unit can support mixed-platform users without taking over the whole box. It charges two batteries simultaneously at a rapid rate, then advances to the next two automatically. That matters when multiple people are sharing packs and dead batteries stack up during the day.

Milwaukee built this unit around gangbox use, not just battery charging. The magnetic base and cleat give you multiple mounting options inside steel storage, which helps free up shelf space and keeps the charger where it will not get buried under tools and materials. Milwaukee also calls out integrated magnet release levers for quick removal from metal surfaces, which makes repositioning easier when the layout of the box changes from job to job.

The built-in 450 lumen rotating flood light is not just an extra add-on. In a deep gangbox or job box, that light helps you find batteries, fittings, hand tools, and chargers without holding a flashlight in one hand. Milwaukee also includes two USB-C 15W ports, which gives crews a practical way to charge personal lighting, phones, or tablets from the same station. That is useful on commercial sites where the gangbox ends up acting like a charging hub for more than just battery packs.

From a power and construction standpoint, this is a corded charger with 120V input, 6.0 max output amps, 2.8 max input amps, and a polycarbonate body. It measures 24.4 inches wide, 7.2 inches long, and 5.2 inches high, with a listed weight of 6.95 pounds. The long, low-profile shape is intentional. Milwaukee specifically designed the layout to fit common gangboxes and allow two chargers side by side in many setups, which is a lot more useful on a crowded site than a compact charger that wastes vertical space.

Compatibility is broad across Milwaukee cordless users. This charger works with all M18 and M12 batteries, so crews running drills, impact drivers, lights, and specialty cordless tools across both systems can centralize charging in one place. Milwaukee also notes REDLINK Intelligence, which means the charger communicates with the battery pack to optimize charge speed and performance instead of simply pushing power blindly.

Who should buy it? This charger makes the most sense for commercial crews, facility teams, service fleets, and contractors who keep batteries in gangboxes or steel storage every day. If you are a solo user with just a couple of packs on a small bench, it is probably more charger than you need. If you are managing multiple batteries, mixed M18 and M12 tools, and a shared gangbox that becomes mission control for the crew, it solves a real problem instead of just adding another accessory.

Milwaukee 48-59-1804 M18 and M12 Gangbox Rapid Charger is a smart buy for crews that charge where they store

This is the kind of charger that makes the whole gangbox setup work better, especially when multiple people are sharing M18 and M12 batteries every day.

• Who it's for: Contractors, service teams, and commercial crews running mixed Milwaukee cordless tools out of a gangbox or steel job box.
• Why it stands out: It does more than charge batteries. You get four bays, rapid two-battery charging, a 450 lumen flood light, USB-C charging, and mounting hardware logic that actually fits the way jobsites are set up.
• Worth knowing: This is a corded charger meant for a mounted jobsite charging station. If you only need a simple bench charger for one or two packs, it is more specialized than necessary.

• Does this charger work with both M18 and M12 batteries? Yes. It is compatible with all Milwaukee M18 and M12 batteries, with two M18-only bays and two hybrid bays for either platform.
• How many batteries can it charge at once? It is a four-bay charger that charges two batteries simultaneously at a rapid rate, then automatically moves to the next two.
• Can it charge devices besides batteries? Yes. It has two USB-C 15W ports for charging small devices and rechargeable personal lighting.
• Is this meant for a gangbox or regular shop shelf? It is specifically designed for gangboxes and steel storage on commercial jobsites, with a magnetic base and cleat for multiple mounting orientations.