Which M18 battery actually works with your tool?

Milwaukee says all M18 packs fit all M18 tools, and that is true. It is also not the question you have when you are about to spend two hundred dollars. You want to know whether this pack will run that tool properly, how many you need, and what you already own that covers it.

Fitting and running properly are different questions. A pack can latch on, power up, and still sag under sustained load, or run out long before the job does — and some tools want two packs, not one. Milwaukee publishes the pieces; they are just spread across hundreds of product pages. This site lines them up. Why we built it.

Start here

• What do I still need to buy? — tell it what you own, and it works out whether you can run the tool you want
• Which M18 battery works with which tool — including where pack choice changes the answer
• M18 battery power levels (PWR1–PWR5) — the chart Milwaukee has not published
• Which M18 charger for which pack — and how much a rapid charger actually saves
• When an M18 kit beats buying bare — exact contents, by SKU
• Browse everything — 258 tools, 9 batteries, 7 chargers, 133 kits

How this is different

Every claim links to the manufacturer page it came from and the date we read it. Where Milwaukee publishes nothing, we say unknown instead of estimating — because an estimate sitting in a column of manufacturer figures is indistinguishable from one.

Compatibility is recorded on three separate axes — does it fit, does it run properly, and is it a sensible pairing. Collapsing those into a single yes is how people end up disappointed by a purchase that was technically compatible.

Currently covering Milwaukee M18 in the United States, with 2385 reviewed compatibility relationships. Independent, and not affiliated with Milwaukee.