# REDLITHIUM 4.0 XC Extended Battery Pack · Milwaukee · M18 — Power tool battery platform and accessory interface compatibility

For REDLITHIUM 4.0 XC Extended Battery Pack · Milwaukee · M18, item is REDLITHIUM 4.0 XC Extended Battery Pack; brand is Milwaukee; system / platform is M18; compatible with is Milwaukee M18 cordless tools, recorded from its source on 2026-08-28.

- **Item:** REDLITHIUM 4.0 XC Extended Battery Pack _(verified: appears in the quote below)_
- **Brand:** Milwaukee _(our reading, not quoted from the source)_
- **System / platform:** M18 _(our reading, not quoted from the source)_
- **Compatible with:** Milwaukee M18 cordless tools _(verified: appears in the quote below)_

## What the source says

> Switch to the REDLITHIUM 4.0 XC Extended Battery Pack to instantly upgrade the runtime and durability of your Milwaukee M18 cordless tools.

## Source

- https://www.milwaukeetool.com/48-11-1840

Last verified: 2026-08-28. Review by: 2027-08-28.
Part of [Power tool battery platform and accessory interface compatibility](https://referencesource.org/power-tool-battery-compatibility/).