M18 Brushless 4-1/2" / 5" Cut-Off Grinder, Paddle Switch
Battery answer
Every reviewed M18 pack powers SKU 2686-20 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 · Grinders · SKU 2686-20 · 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 | 3 lb |
Specification sources (1)
- Milwaukee Tool — manufacturer page, retrieved 2026-07-31
Full specifications
As published by Milwaukee for SKU 2686-20, read 2026-07-31. Values are quoted in their units, not reformatted.
| Height | 4.75 in |
|---|---|
| Length | 12.25 in |
| Width | 10 in |
| Brushless Motor | Yes |
| Colors | Black · Red |
| FUEL | No |
| Handle Type | Barrel Grip |
| Material | Metal |
| Motor Type | Brushless |
| Number of Batteries Included | 0 |
| Number of Pieces Included | 7 |
| ONE-KEY Enabled | No |
| Tool Branding | Brushless (Not FUEL) |
| Warranty | 5 Year Limited Warranty |
What Milwaukee says about it
- Milwaukee brushless motor: optimized for efficiency, this motor delivers more run-time and longer life than a brushed motor
- REDLINK Intelligence: Advanced overload protection defends against abusive applications and monitors the temperature to prevent damage and ensure maximum tool & battery life.
- REDLITHIUM batteries (not included) deliver more work per charge and more work over the life of the battery
- Paddle Switch Design for Increased Comfort and Ease-Of-Use when Operating in Various Positions
- Tool-Free Guard Adjustment for faster guard installations and adjustments
- 5/8"-11 Spindle for Use with Common Grinding Accessories
- Overload Protection: Maximizes motor life
- Electronic Clutch for Kickback Protection
- Compatible with all M18 batteries
Manufacturer marketing copy, reproduced so you can judge it. We have not tested these claims.