Milwaukee M12 Battery Compatibility Guide
Updated: June 15, 2026 | Garage Almanac
The Short Answer
All M12 batteries fit all M12 tools.
| Platform | Milwaukee M12 |
|---|---|
| Nominal voltage | 12V (12V-class) |
| Cell format | 3x 18650 (or 21700) |
| Introduced | 2007 |
| Charges with | Milwaukee M12 chargers, M12/M18 multi-voltage chargers |
| Official info | Milwaukee batteries & chargers |
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The Milwaukee M12 is a 12V-class platform introduced in 2007, built around a 3x 18650 (or 21700) cell pack. All M12 batteries fit all M12 tools.
Worth knowing: Not compatible with M18; the M12/M18 charger charges both but tools do not cross.
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