For phones, tablets, laptops and other small electronics, the Milwaukee M18 TOP-OFF 175W Power Supply (2846-20) is the model to evaluate. It has a 120V AC outlet rated for 175W continuous, USB-C Power Delivery up to 45W and USB-A up to 15W. The right choice depends on your device’s power requirement, the port you will use and how long you need it to run—not simply whether its plug fits.
Which M18 power supply do you need?
Start with the device and the kind of connection it needs. Milwaukee’s 2846-20 is the M18 option here with a 120V AC outlet for compatible small electronics. It accepts M18 batteries, but the battery is sold separately. The product page lists laptops, cellphones, TVs and other small devices as examples of intended use. Milwaukee M18 TOP-OFF 2846-20
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| Model | What it provides | When to consider it |
|---|---|---|
| M18 TOP-OFF 2846-20 | One 120V AC outlet, 175W continuous; USB-C PD up to 45W; USB-A up to 15W. | Small electronics that fit the output limits. Battery and device cords are not included. Milwaukee product page; operator manual |
| M18 TOP-OFF Charger & Power Supply 2847-20 | M18 battery charging and USB power; Milwaukee’s product page does not list a 120V AC outlet. | When you need its battery-charging or USB functions, not an AC outlet. It is not a substitute for the 2846-20. Milwaukee product page |
| M18 CARRY-ON 2845-20 | A higher-output portable power option with published running- and starting-watt ratings on its product page. | Consider it if the load exceeds the 2846-20’s 175W continuous rating; check the appliance’s startup demand and the product manual. Milwaukee product page |
| M18 TOP-OFF 350W 2856-20 | Announced 350W model with pure sine wave output, two AC outlets and USB-C outputs. | Milwaukee’s page currently labels it “coming soon,” so verify availability before treating it as an option to buy. Milwaukee product page |
Will a Milwaukee M18 inverter run your laptop?
It may, if the laptop’s input requirement is within the output of the port you plan to use. Check the laptop’s power adapter label or its manufacturer’s specifications and compare them with the 2846-20’s ratings. For AC, the limit is 175W continuous. For USB-C charging, the port supports USB-C PD up to 45W; the laptop and cable must support a compatible charging arrangement. USB-A is rated up to 15W and may not meet a laptop’s charging needs.
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A plug fitting the AC receptacle does not establish compatibility. Milwaukee’s manual excludes appliances, power tools, air conditioners, sump pumps, compressors and other larger electrical devices. Do not use the 2846-20 for those loads. A device that exceeds the output rating or needs a startup surge the unit cannot provide is also a poor fit. Read the 2846-20 operator manual.
#1 Best Overall
- Faster simultaneous power
- 175 W continuous watts
- Rafter hooks allows for versatility on the jobsite to hang on common materials or carts
- Battery, charger and device cords not included
- Lightweight, compact design
How to match a device to the right output
- Find the input requirement. Read the device’s charger label or manufacturer specifications. Note the required voltage and power, and whether the device charges over USB-C PD or requires AC.
- Choose the matching port. Use the 120V AC receptacle for an appropriate AC adapter, USB-C PD for a compatible USB-C charging device, or USB-A for a device whose needs fit that port.
- Compare the demand with the limit. The 2846-20 is rated for 175W continuous at AC, up to 45W at USB-C and up to 15W at USB-A. Do not assume an AC device is suitable just because its rated draw is below 175W; Milwaukee’s exclusions still apply, and startup demand can matter.
- Check the USB-C cable. Milwaukee says fast charging depends on a compatible cable and connected device. The 2846-20 does not include device cords. Milwaukee’s TOP-OFF announcement.
- Estimate how long you need power. Runtime and charging capacity vary with the M18 battery capacity and the connected load. Choose the battery for the use you expect rather than treating the inverter’s wattage as a runtime estimate.
What can the 2846-20 power, and what can’t it?
Its three outputs serve different needs: one 120V AC receptacle rated 175W continuous, one USB-C PD port rated up to 45W and one USB-A port rated up to 15W. Milwaukee describes the unit for laptops, cellphones, TVs and other small devices, but those examples do not override the output ratings or the manual’s restrictions.
Do not choose it for appliances, power tools, air conditioners, sump pumps, compressors or other larger electrical equipment. For an intended device with an AC adapter, inspect the adapter’s input rating and consider any startup demand. For USB charging, check the device’s required charging protocol and the cable as well as its wattage.
Rank #2
- Compatible with 18V Batteries: This Azocek power inverter is specifically designed Compatible with Mil-wau-kee 18V batteries (e.g., 48-11-1815, 48-11-1850, 48-11-1820), powered directly by the battery, provides portable power for outdoor activities or emergencies anytime, anywhere (Battery not included)
- 220W DC to AC Power Conversion: Converts 18V DC to 110V-120V AC, providing a reliable power source for phones, laptops, tablets, and other small electronics, making it essential for travel and power outages.
- Fast Charging USB and Type-C Ports: This Azocek power inverter features one AC outlet, two 18W USB QC ports, and one 30W PD Type-C port, enabling the simultaneous rapid charging of multiple devices.
- Multi-Function 400LM LED Light: Equipped with a 3-level adjustable brightness LED work light, strobe function, and a 90-degree adjustable lighting angle, making it ideal for outdoor use and emergency situations.
- Enhanced Safety Features: This inverter provides comprehensive protection against short circuits, overcurrent, low voltage, overheating, overload, and over-discharge. The built-in cooling fan effectively dissipates heat, ensuring reliable operation in various environments.
How long will an M18 battery last?
The power supply requires an M18 battery, and the 2846-20 package does not include one. Milwaukee’s TOP-OFF Announcement Chart V3 gives estimates that vary by battery; they are manufacturer figures, not independently tested guarantees. The chart text does not provide enough test detail to turn them into a promised runtime or charge count. Milwaukee TOP-OFF announcement and chart.
| M18 battery listed by Milwaukee | Phone charges | Tablet charges | Laptop charges | Monitor runtime | Fan runtime |
|---|---|---|---|---|---|
| HD12.0 | 12 | 4.8 | 2.7 | 280 minutes | 151 minutes |
| XC5.0 | 5.5 | 2.0 | 1.0 | 118 minutes | 72 minutes |
| CP2.0 | 2.4 | 0.8 | 0.5 | 46 minutes | 27 minutes |
These are the battery-specific estimates shown in Milwaukee’s chart; the chart version is V3, and the retrieved chart text does not state a publication date or year. Real results depend on the device, load and conditions. Treat the estimates as planning guidance rather than a guarantee.
Rank #3
- Portable AC Power Anywhere: Converts compatible battery power into 110V AC output up to 220W, making it ideal for small appliances, fans, lights, chargers and emergency backup during camping, outdoor work and travel. Battery not included
- Charge Multiple Devices: Features 1 × 30W USB-C PD, 2 × 18W USB-A QC ports and 1 AC outlet, allowing you to power laptops, tablets, phones, cameras and other everyday electronics simultaneously
- Compatible with Milwaukee 18V Battery Packs: Including 48-11-1815, 48-11-1820, 48-11-1840, 48-11-1850 and more. The secure slide-on design locks the battery firmly in place during use (Battery Not Included)
- 400LM LED Work Light: Built-in LED light offers 35%, 70% and 100% brightness levels, plus Strobe Mode for camping, roadside repairs, outdoor work and power outages
- Compact Design with Smart Protection: Weighing only 0.68 lb, this lightweight inverter fits easily into a backpack or tool bag. The built-in cooling fan and intelligent protection system help guard against overheating, overload, over-current, short circuit and over-discharge for dependable everyday use
What Milwaukee says about USB-C charging
Milwaukee’s announcement claims up to 75% faster charging to 80% than conventional 5W wall chargers and gives a smartphone example of 0–50% in roughly 30 minutes. These are company claims, not independent test results; the faster-charging claim depends on a compatible device and cable, and the comparison is specifically with 5W chargers. Milwaukee’s announcement.
Quick Recap
Best Value
- 300W POWER CONVERTER: This 300W power inverter can step up DC 18V to AC 110V-120V, quickly convert your battery into a portable charger to provide reliable power source for phones, laptops, tablets, radios, fans, work lights, small electronics devices and more. Ideal for outdoor activities, road travel, emergency power supply and home backup power
- INVERTER BATTERY COMPATIBILITY: The cordless power inverter is battery operated, compatible with Milwaukee 18V batteries, suitable for 48-11-1815, 48-11-1820, 48-11-1828, 48-11-1840, 48-11-1850 and more. Simply slide the adapter into the battery slot and lock it in place to power your electronic devices anytime, anywhere (Note: Battery Not Included)
- PD 65W FAST-CHARGING & MUTIL PORTS: Portable inverter power station equipped with 2 AC plug outlets(Total Power 300W Max), a Type-C PD 65W fast charging and 1 USB-A port(18W Max). Battery adapter equipped with 1 USB-A port(5V 3A) and 1 Type-C port(PD 20W Max). When both inverter Type-C port and USB-A port are used simultaneously, the two charge port output power is 5V2A, 10W Max
- ENHANCED SAFETY FEATURES: Power converter charger built-in intelligent chip provides low-voltage, over-voltage, over-load, over-current, short-circuit, over-heat, and under-voltage protection. When battery input DC voltage drops below 15.5V, the AC outlets cut off automatically, other output ports remain functional. It is recommended to remove the battery to prevent unnecessary discharge and preserve battery life. When the input DC voltage drops below 15V, all power supply functions stop operation
- COMPACT PORTABLE DESIGN: Battery power converter features a compact, lightweight design, only 4.8 x 3 x 1.8 inches size, making it easy to carry. Perfect for camping, daily outings or home power outages. Power inverter built-in cooling fan automatically start operation when the inverter AC power switch is turned on, ensuring efficient heat dissipation. Note: High-power electronic devices exceeding 300W are not recommended
Rank #4
- Dual Battery Design & Battery Recharging: Compatible with 18V battery packs (battery not included). Supports 2 compatible batteries with automatic switching for extended runtime. The USB-C1 dual-role port also supports up to 140W input and 7A charging to recharge installed batteries
- Pure Sine Wave for Sensitive Electronics: Delivers up to 350W pure sine wave AC output, providing clean and stable power for laptops, CPAP machines, projectors and other sensitive electronics. Both AC outlets share a combined 350W maximum output
- High-Power USB Charging Ports: Features 140W USB-C PD3.1 (Input/Output), 65W USB-C, and 2 × 18W USB-A ports for charging laptops, tablets, phones and other USB-powered devices. Includes a 240W USB-C charging cable
- Built-In 600LM LED Emergency Light: Kzreect portable inverter integrates LED lamp with 3 brightness levels plus Strobe and SOS modes provides reliable lighting for camping, roadside emergencies, and unexpected power outages
- Reliable Protection & Smart Operation: Built-in protection against overload, short circuit, overheating and over-discharge, plus an intelligent cooling fan for reliable performance. For best results, use 4Ah or larger batteries. AC and USB outputs are disabled while batteries are charging
Buying checklist
- Confirm the model is 2846-20 if you need a 120V AC outlet alongside USB ports.
- Verify that the intended device’s power requirement fits the rating for its chosen output.
- Rule out loads Milwaukee excludes, including appliances, power tools, air conditioners, sump pumps and compressors.
- Check whether you already own a compatible M18 battery; one is not included with the power supply.
- For USB-C PD, use a cable compatible with the device and charging requirement; device cords are not included.
- Use Milwaukee’s battery-specific runtime figures as estimates, not guaranteed results.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
