M18 Brushless 18" Fan
Battery answer
Every reviewed M18 pack powers SKU 0821-20 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 · Jobsite Fans · SKU 0821-20 · 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
| Brushless | Yes |
|---|---|
| Weight, bare tool | 17 lb |
Specification sources (1)
- Milwaukee Tool — manufacturer page, retrieved 2026-07-31
Full specifications
As published by Milwaukee for SKU 0821-20, read 2026-07-31. Values are quoted in their units, not reformatted.
| Air Flow | 3400 CFM |
|---|---|
| Height | 26.5 in |
| Length | 11 in |
| Width | 23.3 in |
| Blade Diameter | 18 in |
| Brushless Motor | Yes |
| FUEL | No |
| Motor Type | Brushless |
| Number of Pieces Included | 1 |
| Number of Speed Settings | 3 |
| ONE-KEY Enabled | No |
| PACKOUT Compatible | No |
| Warranty | 1 Year Warranty |
What Milwaukee says about it
- CORDED PERFORMANCE. DURABLE COOLING. TOTAL MOBILITY.
- Air circulation over 50 ft reach and 13.5 MPH air speed
- Reinforced design for impact, water, and dust resistance
- Brushless motor for durable cooling and increased life
- 18-inch blade allows for quick and efficient cooling, drying, or ventilation
- 360-degree head rotation to adapt to any job
- Stackable design for optimized storage and transportation
- 3 speed settings: high, medium, low
- The M18HD12.0 battery delivers 5 hrs. of runtime on high and 23 hrs. on low
- The M18XC5.0 battery delivers 2 hrs. of runtime on high and 9 hrs. on low
- Integrated AC plug For extended runtime
- Fits all M18 batteries
- 1-year limited warranty
Manufacturer marketing copy, reproduced so you can judge it. We have not tested these claims.