M18 Magnetic Extendable Boom Light
Battery answer
Every reviewed M18 pack powers SKU 2129-20 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 · Site Lights · SKU 2129-20 · 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 | 8.22 lb |
|---|
Specification sources (1)
- Milwaukee Tool — manufacturer page, retrieved 2026-07-31
Full specifications
As published by Milwaukee for SKU 2129-20, read 2026-07-31. Values are quoted in their units, not reformatted.
| Height | 6.71 in |
|---|---|
| Length | 18.48 in |
| Width | 4.37 in |
| Material | Glass Filled Nylon |
| Number of Batteries Required | 1 |
| ONE-KEY Enabled | No |
| PACKOUT Compatible | No |
| Warranty | 5 Year Tool Warranty, LED Limited Lifetime Warranty |
What Milwaukee says about it
- 2,500 Lumens of TRUEVIEW High-Definition Output
- 890° of Horizontal Rotation and 900° of Vertical Rotation for Complete Light Head Adjustability
- Strong Magnet Holding Power for Secure Placement
- Over 4.5 hours of Run-Time on HIGH with (1) M18 XC5.0 Battery
- 3 Modes to Manage Output and Runtime
- Integrated Magnet Release for Quick Removal From Surfaces
- Two On/Off Buttons on Base and Light Head
- Folds Down For Easy Transport and Storage
- Rubber Storage Boot Protects Metal Surfaces
- IP54: Dust and Water Resistant
- 6.5ft Drop Rating
- Resistant to Corrosion and Common Automotive Chemicals
- 5-Year Tool, Limited Lifetime LED Warranty
- Part of the M18 System, Featuring Over 250+ Tools
Manufacturer marketing copy, reproduced so you can judge it. We have not tested these claims.