Quick Specs
What Battery Does the Milwaukee 2804-20 Use?
The Milwaukee 2804-20 M18 FUEL 1/2″ Hammer Drill/Driver runs on the Milwaukee M18 18V battery platform. Any Milwaukee M18 REDLITHIUM battery (18V) will power this tool, from compact 1.5Ah packs up to the high-output 6.0Ah batteries.
About the Milwaukee 2804-20
The Milwaukee 2804-20 is a flagship M18 FUEL hammer drill featuring a POWERSTATE brushless motor that delivers up to 1,200 in-lbs of peak torque and 32,000 BPM. With a 1/2-inch all-metal ratcheting chuck and AUTOSTOP control mode for added safety, this drill handles everything from driving screws to drilling through masonry. It’s one of the most powerful 18V hammer drills available, making it a top choice for professional contractors.
Compatible Batteries
| Battery Model | Capacity | Weight | Best For |
|---|---|---|---|
| 48-11-1815 | 1.5Ah | 0.75 lb | Light-duty, overhead work |
| 48-11-1820 | 2.0Ah | 0.81 lb | General light tasks |
| 48-11-1830 | 3.0Ah | 1.06 lb | Balanced weight/runtime |
| 48-11-1840 | 4.0Ah | 1.25 lb | Good all-round choice |
| 48-11-1850 | 5.0Ah | 1.5 lb | Extended runtime for heavy drilling |
| 48-11-1860 | 6.0Ah | 1.56 lb | Maximum runtime and power delivery |
Recommended Cutting Discs
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Recommended Battery
For the 2804-20, the 48-11-1850 (5.0Ah) or 48-11-1860 (6.0Ah) High Output batteries are recommended. The M18 FUEL hammer drill is a high-demand tool, and larger capacity batteries ensure you get full power delivery and enough runtime for sustained drilling and hammering tasks on the jobsite.
Minimum Battery
The 48-11-1820 (2.0Ah) compact battery will run the 2804-20, but expect significantly shorter runtime under heavy load. The compact packs are best reserved for light drilling or driving screws — for hammer drilling into concrete or masonry, step up to at least a 4.0Ah or 5.0Ah pack.
Battery Compatibility Notes
- All M18 REDLITHIUM batteries are backwards and forwards compatible with every M18 tool
- M18 High Output batteries provide increased power and run cooler in high-demand tools like the 2804-20
- M18 batteries are NOT compatible with M12 tools or older V18 tools
- Milwaukee M18 batteries use a slide-on connection and include built-in fuel gauge
Related Resources
- Milwaukee 48-11-1850 Battery Details
- Milwaukee 48-11-1860 Battery Details
- Milwaukee M18 Battery Compatibility Guide
- Battery Compatibility FAQ
Battery sizing, runtime & troubleshooting
Recommended pack: For masonry and large bits a 5.0Ah XC holds power best; compact packs are fine for screwdriving and light drilling.
Compatibility caveats: All M18 packs fit; this model is discontinued, replaced by the 2904-20.
If it won’t start or cuts out: Bogging in masonry or cutting out means the pack is too small under load — fit a 5.0Ah.
Runtime: No official figure published.
Versus the adjacent model: A heavier-draw partner to the impact driver — in hammer mode it wants a 5.0Ah pack where the driver is content on a compact.
Where to Buy
Ready to add the Milwaukee 2804-20 to your toolkit? Check current prices and availability:
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