M18 Transfer Pump
Battery answer
Every reviewed M18 pack powers SKU 2771-20 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 · Transfer Pumps · SKU 2771-20 · 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.”
Kit configurations
Ways Milwaukee sells this exact tool in a box. Contents are decomposed to manufacturer SKUs; non-SKU’d accessories — side handles, belt clips, cases — are omitted because they carry no compatibility meaning.
M18 Transfer Pump Kit (2771-21)
| Qty | Component | SKU |
|---|---|---|
| 1 | M18 Transfer Pump | 2771-20 |
| 1 | M18 & M12 Multi-Voltage Charger | 48-59-1812 |
| 1 | M18 REDLITHIUM XC Extended Capacity Battery | 48-11-1828 |
Battery capacity in the box: 3.0 Ah across 1 pack(s). This is the directly comparable capacity when weighing the kit against the bare tool plus packs.
Contents provenance: manufacturer claim; review completed 2026-07-31 by jon.
Contents sources for 2771-21 (1)
- Milwaukee Tool — manufacturer page, retrieved 2026-07-31
Tool specifications and manufacturer claims
Basic tool facts
| Weight, bare tool | 7.9 lb |
|---|
Specification sources (1)
- Milwaukee Tool — manufacturer page, retrieved 2026-07-31
Full specifications
As published by Milwaukee for SKU 2771-20, read 2026-07-31. Values are quoted in their units, not reformatted.
| Peak Amps | 3 A |
|---|---|
| Height | 7.4 in |
| Length | 13 in |
| Width | 5.75 in |
| Branding | Badge: Not Applicable · Tool: Not Applicable |
| FUEL | No |
| Motor Type | Not Applicable |
| Number of Pieces Included | 1 |
| ONE-KEY Enabled | No |
| Warranty | 5 Year Limited Warranty |
What Milwaukee says about it
- Compatible with all M18 REDLITHIUM battery packs
- Head height: up to 75 ft.
- Inlet connection: 3/4 in. brass
- Lift up to 18 ft.
- Outlet connection: 3/4 in. brass
- Part of the M18 System of over 125+ tools
- Industry’s first cordless transfer pump
- Self-priming; connect and go
Manufacturer marketing copy, reproduced so you can judge it. We have not tested these claims.