M18 Compact Brushless 1/4" Hex 3-Speed Impact Driver
Battery answer
Every reviewed M18 pack powers SKU 3651-20 at full rated performance, with no battery-specific condition.
- Battery platform
- Milwaukee M18
- Packs required
- 1 pack
- 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 · Impact Drivers · SKU 3651-20 · 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 | 1.7 lb |
|---|
Specification sources (1)
- Milwaukee Tool — manufacturer page, retrieved 2026-07-31
Full specifications
As published by Milwaukee for SKU 3651-20, read 2026-07-31. Values are quoted in their units, not reformatted.
| Height | 7.7 in |
|---|---|
| Length | 4.4 in |
| Width | 2.1 in |
| Chuck Size | 1/4 in |
| Chuck Type | Hex |
| Colors | Black · Red |
| DRIVE CONTROL | 3-Mode |
| Drive Size | 1/4 in Hex |
| FUEL | No |
| Handle Type | Pistol Grip |
| IPM Range | 0-4900 IPM |
| Material | Metal |
| Maximum Torque | 1700 in-lbs |
| Motor Type | Brushless |
| Number of Batteries Included | 0 |
| Number of Batteries Required | 1 |
| Number of Pieces Included | 1 |
| ONE-KEY Enabled | No |
| Tool Branding | Compact Brushless |
| RPM Range | 0-3600 RPM |
| Warranty | 5 Year Limited Warranty |
What Milwaukee says about it
- Compact size allows for unrivaled access in tight spaces
- Brushless Motor delivers the power to quickly complete most common applications
- Includes 3-Mode Drive Control for easier control
- Professional Durability with all metal gearcase and gears
- 0-3600 RPMs
- 1,700 in-lbs. of Peak Torque
- 4.4" in Length and 2.1" in Width
- 1.7 lbs tool only
- 5 year tool warranty
- Compatable with 250+ solutions
- Includes: M18 Compact Brushless 1/4" Hex 3-Speed Impact Driver (3651-20)
Manufacturer marketing copy, reproduced so you can judge it. We have not tested these claims.