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 an M18 FUEL hammer drill (now discontinued by Milwaukee) 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, this drill handles everything from driving screws to drilling through masonry. Milwaukee called it the “Industry’s Most Powerful Drill” at launch.
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 Batteries
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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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