M18/M12 Wireless Jobsite Speaker
Battery answer
Every reviewed M18 pack powers SKU 2891-20 at full rated performance, with no battery-specific condition.
- Battery platform
- Milwaukee M18
- Packs required
- Not published by Milwaukee
- 9 work without conditions.
Battery requirement sources (1)
- Milwaukee Tool — manufacturer page, retrieved 2026-07-31
Compare the reviewed packs See tool specifications and sources
Milwaukee · Speakers · SKU 2891-20 · Milwaukee source
Compare the reviewed M18 packs
| Battery | Capacity | Energy | Power level | Answer |
|---|---|---|---|---|
| 48-11-1813 | 12 Ah | 216 Wh | PWR5 | Works |
| 48-11-1820 | 2 Ah | 36 Wh | not published | Works |
| 48-11-1828 | 3 Ah | 54 Wh | not published | Works |
| 48-11-1840 | 4 Ah | 72 Wh | not published | Works |
| 48-11-1850 | 5 Ah | 90 Wh | PWR2 | Works |
| 48-11-1850R | 5 Ah | 90 Wh | not published | Works |
| 48-11-1861 | 6 Ah | 108 Wh | PWR4 | Works |
| 48-11-1865 | 6 Ah | 108 Wh | PWR3 | Works |
| 48-11-1881 | 8 Ah | 144 Wh | PWR4 | Works |
Energy is capacity × nominal voltage — our arithmetic on Milwaukee’s figures, not a number they publish. It is the only honest way to compare packs across capacities. Power level is Milwaukee’s own PWR tier where they publish one.
Compatibility sources (1)
- Milwaukee Tool — manufacturer support, retrieved 2026-07-30“All M18 Batteries are compatible with M18 tools & chargers.”
Tool specifications and manufacturer claims
Basic tool facts
| Weight, bare tool | Not published for this exact SKU |
|---|
Specification sources (1)
- Milwaukee Tool — manufacturer page, retrieved 2026-07-31
Full specifications
As published by Milwaukee for SKU 2891-20, read 2026-07-31. Values are quoted in their units, not reformatted.
| Battery Charging | Not Applicable |
|---|---|
| Modes | Bluetooth, AUX |
| USB Charging Port | Yes |
| Tool Warranty | 1 year Limited Warranty |
| Power Source | Cordless |
| Material Composition | Plastic |
| Length | 7.5 in |
| Weight | 5.3 lb |
| Height | 6.5 in |
| Width | 13.75 in |
| Voltage | 12v and 18v |
| Input Voltage | 0 |
| PACKOUT Compatible | No |
| M12 M18 Compatible | Yes |
What Milwaukee says about it
- 1 Year Limited Warranty.
- 2 High Definition Mid-Woofers maximizes clarity at loudest volume.
- 2 High Range Tweeters drives greater range of treble.
- 2 Passive Radiators maximizes clarity and volume of bass.
- Compatible with the M18 and M12 systems featuring over 200 tools, or power with AC adapter.
- Impact resistant roll cage.
- Industry's Loudest, Clearest Sound System.
- IP54 water and dust protected.
- Protected 2.1A USB power outlet.
- Stream high definition music wirelessly with Bluetooth from over 100ft.
Manufacturer marketing copy, reproduced so you can judge it. We have not tested these claims.