Milwaukee MX FUEL CP4.0 Battery Delivers More Runtime Without More Bulk
Sep 15, 2026
Milwaukee MX users… this one's for you.
Milwaukee just dropped its new MX FUEL REDLITHIUM CP4.0 Battery Pack, which delivers up to 33% more runtime than the CP3.0 while maintaining the same compact size. That means crews can keep demanding equipment running longer without adding unnecessary weight or bulk.
For contractors already invested in MX FUEL, this is the kind of upgrade that makes an immediate difference on the jobsite.
More Runtime in the Same Size
The biggest improvement is simple: Milwaukee increased the battery capacity from 3.0Ah to 4.0Ah without increasing the pack’s size.
That extra juice means you can actually finish the job before swapping batteries, and you still get the easy-carry vibes of a compact pack. Concrete, demo, drain cleaning, whatever you’re throwing at it, the CP4.0 keeps your tools running.
Less Time Waiting on a Charge
A high-capacity battery does not help much if it spends the entire day on the charger. The MX FUEL CP4.0 is capable of charging from empty to 100% in as little as 45 minutes, helping crews get back to work quickly.
Combined with its longer runtime, that faster turnaround makes it easier to keep equipment moving throughout demanding workdays.
Key Features and Benefits
- Up to 33% more runtime: Delivers longer operation than the MX FUEL CP3.0.
- Same compact size: Adds capacity without increasing the battery’s overall footprint.
- 4.0Ah capacity: Provides more working time for demanding MX FUEL applications.
- Fast charging: Capable of reaching a full charge in as little as 45 minutes.
- Complete compatibility: Fits all Milwaukee MX FUEL equipment and chargers.
- PWR Level 1: Compact option on the Milwaukee MX FUEL REDLITHIUM power scale.
- Built for tough jobsites: Features five times more overmold in key impact zones.
- Protected construction: Designed to withstand jobsite, weather and environmental conditions.
- Onboard fuel gauge: Displays the remaining charge so users can plan battery changes.
- Two-year warranty: Backed by Milwaukee for added confidence.
One Battery for the Entire MX FUEL System
There is no need to purchase different batteries for different MX FUEL machines. The CP4.0 works across the entire system and can be charged using any MX FUEL charger.
That makes it a great addition for current MX FUEL users. It can serve as a primary compact battery, a dependable backup or an extra pack that helps keep multiple pieces of equipment working throughout the day.
A Serious Upgrade for MX FUEL Users
The CP4.0 checks all the boxes: more runtime, fast charging, built tough for the jobsite, and it plays nice with all your MX FUEL gear.
If you already rely on MX FUEL equipment, the CP4.0 gives you more working time without changing the compact battery size you are used to. More runtime. Less downtime. No added bulk.
Shop the new Milwaukee MX FUEL REDLITHIUM CP4.0 Battery Pack at Acme Tools.
