Short answer: DeWalt 20V MAX and Milwaukee M18 are separate, non-interchangeable battery platforms, and neither is a straightforwardly “bigger” battery than the other — DeWalt’s own spec sheet says 20V MAX is a peak-voltage reading of a battery whose nominal voltage is 18V, and Milwaukee states M18 is 18 volts outright with no separate peak-voltage marketing number. In practical tool power, DeWalt’s current flagship compact hammer drill is rated higher on paper (2,100 in-lbs) than Milwaukee’s (1,400 in-lbs), but that’s one tool comparison, not a platform-wide verdict.
“20V” vs “M18” sounds like DeWalt should simply be the bigger battery. It isn’t, once you read what each brand actually publishes. This guide puts the two platforms’ own numbers side by side.
Is DeWalt 20V MAX actually a higher voltage than Milwaukee M18?
No, not in the way the names suggest. DeWalt states outright: “Maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18.” That’s DeWalt’s own battery, described two ways — 20V is the no-load peak reading, 18V is the resting/average voltage under actual use. Milwaukee, by contrast, states plainly that “M18 tools use M18 REDLITHIUM batteries rated at 18 volts” — no separate peak-voltage figure in Milwaukee’s own marketing.
Put the two official statements side by side and both platforms are, in nominal terms, 18V-class systems. DeWalt applies a peak-voltage label to its packaging and marketing; Milwaukee doesn’t use the same convention. Neither company’s own numbers support “20V beats 18V” as a meaningful platform comparison.
How do their flagship tools actually compare on paper?
Since the batteries are functionally similar-class, the more useful comparison is what each platform’s best current tools deliver. Using each brand’s flagship compact 1/2″ hammer drill:
| DeWalt DCD1007B (20V MAX XR) | Milwaukee 2904-22 (M18 FUEL) | |
|---|---|---|
| Max torque | 2,100 in-lbs | 1,400 in-lbs |
| Chuck | 1/2″ ratcheting, carbide inserts | 1/2″ all-metal, carbide teeth |
| Battery capacities available (platform-wide) | FlexVolt: 6Ah, 9Ah, 12Ah, 15Ah | M18: examples include XC6.0 (6.0Ah), HD12.0 (12.0Ah) |
Editorial note: these are each brand’s current flagship compact hammer drill, not a controlled identical-spec test — the same caution this site applies to the Milwaukee M12-vs-M18 torque comparison. On paper, DeWalt’s flagship rates higher for this specific tool category at this point in time; that’s a snapshot of one product line, not a verdict on which platform is better overall.
Are the batteries interchangeable between the two brands?
No — covered in full in the cross-brand battery interchangeability guide on this site. DeWalt states its batteries work with DeWalt 20V MAX tools; Milwaukee states its batteries work with Milwaukee M18 tools; neither states compatibility with the other. This guide is about comparing the two platforms’ own numbers side by side, not re-arguing whether they physically connect (they don’t).
So which platform should you actually choose?
Editorial conclusion, not an official recommendation from either brand: if you’re already invested in one platform’s batteries and chargers, that sunk cost usually outweighs a torque-spec difference on one tool category. If you’re choosing from scratch, DeWalt’s FlexVolt line gives you a path up to 60V-class tools on the same battery family (see the dedicated DeWalt 20V MAX/FlexVolt guide on this site); Milwaukee doesn’t have a directly equivalent single-battery voltage-bridging system on M18 today, based on the pages reviewed for this site’s Milwaukee guide.
How this was checked
This guide draws on DeWalt’s DCD1007B product page (new for this comparison) plus DeWalt and Milwaukee facts already sourced for the dedicated DeWalt 20V MAX/FlexVolt and Milwaukee M12-vs-M18 guides on this site. No new claims are made beyond what those official pages state.
Sources checked: 2026-08-05. A new review date will only be set after the linked pages are re-checked.