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Unconditional Satisfaction GuaranteeNo Shipping Fees Above 302 Months to Decide. Returns Simplified.175W On-Demand PowerTurns any compatible M18 battery into a compact power source for small electronics. That means you can keep phones, laptops, lights, and similar devices running without hunting for a wall outlet. Three Ways to ChargeWith one 120V AC outlet, one 45W USB-C Power Delivery port, and one USB-A 2.4A port, the Milwaukee M18 TOP-OFF 175W Power Supply can handle multiple everyday devices at the same time. Jobsite-Friendly SetupThe compact body and built-in metal rafter hook make it easy to hang from carts, lumber, or other common jobsite surfaces when bench space is tight.
The Milwaukee M18 TOP-OFF 175W Power Supply, Model 2846-20, is a compact battery-powered inverter that lets you run or recharge small electronics from any compatible Milwaukee M18 battery. This is a power supply designed for powering and charging small devices on the jobsite, in the truck, or anywhere you do not have easy access to a wall outlet. If you already run M18 tools, this gives that same battery platform another job beyond drills, impacts, and lights.
What makes this unit useful is the output setup. You get 175 watts of continuous power along with one 120V AC outlet, one USB-C Power Delivery 45W port, and one USB-A 2.4A port. In plain terms, that means you can charge or power up to three devices at once, including phones, tablets, laptops, lights, and other small electronics. Milwaukee specifically positions it for personal devices and small electronics, not for high-draw tools or heating appliances, which is the right way to look at it.
The USB-C Power Delivery port matters here because it is not just an afterthought. At 45 watts, it is built to charge newer devices faster than basic low-output wall chargers. For anyone using a laptop, tablet, or phone as part of a mobile workstation, that is the difference between keeping the device alive and actually getting meaningful charge back during the workday.
Milwaukee kept the form factor small and light at 0.8 lb, with overall dimensions of 3.78 inches long, 3.3 inches wide, and 3.33 inches high. That compact size is a big part of the appeal. It does not take up much room in a bag, gang box, or truck compartment, and it is easy to keep around as a problem-solver when you need quick portable power for diagnostics, communication, lighting, or charging.
For real jobsite use, the built-in metal rafter hook is one of those simple features that earns its keep. Milwaukee designed it so you can hang the unit from common materials or carts when worksurface space is limited. That keeps your power source off the floor, closer to eye level, and easier to manage around cords, tools, and materials. It is a small detail, but it makes the unit more practical in unfinished spaces, service calls, and temporary work areas.
From a system standpoint, the biggest advantage is straightforward compatibility. The unit fits all Milwaukee M18 batteries, so there is no separate battery platform to buy into. If your shop, crew, or truck already runs M18, this is an easy add-on. It also includes overload protection, which is important for a portable inverter like this because it helps protect both the unit and the connected electronics when the load exceeds what the power supply is designed to handle.
Who is this for? Electricians, HVAC techs, plumbers, maintenance crews, service pros, remodelers, and anyone building a mobile workstation around the Milwaukee M18 platform. It also makes sense for serious DIY users who already own M18 batteries and want a clean way to keep devices charged during projects, power outages, camping, or travel. If your goal is portable power for laptops, phones, compact lights, and similar electronics, this is the right tool. If you need to run high-draw power tools, heated gear, kitchen appliances, or other heavy loads, this is not the unit for that job.
This setup shows exactly where this unit earns its keep. You can keep a phone charging and power a small light at the same time without stopping work to find building power.
Service work rarely happens next to a clean bench and a free outlet. This compact inverter is made for utility rooms, unfinished spaces, and other spots where you need charging power close by.
The control layout is simple and easy to understand. You have the outlets right on top, so plugging in chargers and cords is quick, even when the unit is sitting on the floor or hanging nearby.
Battery, charger, and device cords are not included.
| Battery Platform | M18 |
|---|---|
| Output Power | 175 W continuous |
| AC Output | 120V outlet |
| USB-C Output | 45W Power Delivery |
| USB-A Output | 2.4A |
| Weight | 0.8 lb |
| Dimensions | 3.78 in L x 3.3 in W x 3.33 in H |
| Overload Protection | Yes |
Battery Platform Fits all Milwaukee M18 batteries. Device Connections Supports small electronics and personal devices through one 120V AC outlet, one USB-C PD port, and one USB-A port.
ElectricalHVACPlumbingMaintenanceRemodelingMobile WorkstationsCharging Small ElectronicsJobsite Lighting Support
Use the USB-C PD port for your phone, tablet, or laptop first, and save the AC outlet for devices that actually need a wall-style plug. That gets you more efficient charging and helps you make better use of the available 175 watts.
5 Year Limited Warranty.
Tool Nut’s Take
The Milwaukee M18 TOP-OFF 175W Power Supply is one of those tools you do not think you need until you are on a service call with a dying phone and no outlet in sight.
