Your primary toolkit is Milwaukee M18, but a DeWalt 20V MAX tool would solve a specific problem—and renting or buying a whole new battery system isn’t practical. A Milwaukee to DeWalt adapter lets you use your existing Milwaukee batteries in DeWalt tools. Both platforms are 18V nominal, so electrically they’re identical; an adapter simply bridges the mechanical gap.
This guide reviews the best Milwaukee to DeWalt adapters available in the UK, explains how they work, covers battery compatibility, and outlines key practical considerations.
How Milwaukee to DeWalt Adapters Work
The Milwaukee M18 platform and DeWalt 20V MAX platform deliver the same nominal voltage—both are 18V. DeWalt labels theirs “20V MAX” as a marketing distinction from older 18V CompactDrill tools, but they’re electrically equivalent. The only difference is the physical shape and contact geometry of the battery and tool mounting interface.
A Milwaukee to DeWalt adapter is a passive mechanical clip that fits onto your Milwaukee M18 battery and presents the DeWalt contact interface to any 20V MAX tool. The adapter contains no active electronics—it’s purely a mechanical bridge. Because of this, adapters work for tool use only. You cannot reverse the process to charge a Milwaukee battery in a DeWalt charger (DeWalt chargers won’t recognise the Milwaukee battery without proper electronics).
The adapter typically adds 12–15mm of height to your battery pack. This is usually unnoticed, but always test fit before working overhead, in confined spaces, or placing the battery in tight compartments.
Best Milwaukee to DeWalt Adapters
Badaptor MIL-DEW (Premium Pick)
The Badaptor MIL-DEW is purpose-engineered for Milwaukee-to-DeWalt conversion. It features a rigid ABS plastic construction with a secure snap-fit mechanism and comes with a lifetime warranty against manufacturing defects. Badaptor is a UK-based company, so warranty support is straightforward and reliable.
Priced at approximately £23–29, the Badaptor is the premium option. The lifetime warranty is valuable assurance if you plan to rely on the adapter regularly or professionally. Many UK contractors who work across multiple tool brands keep a Badaptor in their van as a permanent investment, rotating it between batteries as needed.
Buy Badaptor MIL-DEW on Amazon
DL18ML Adapter (Best Value)
The DL18ML is a straightforward clip-on adapter that has become popular among UK trades. Priced at £18–24, it sits in the sweet spot between budget and premium. The design is simple and proven—thousands of users rely on it weekly without issue. DL18ML has accumulated strong Amazon reviews from electricians, plumbers, and general contractors.
The build quality is solid plastic with reliable contacts. Warranty is typically 12 months. This is the adapter to choose if you want proven reliability without the lifetime-warranty premium. It’s durable enough for regular professional use at a fraction of the Badaptor price.
POWHAZY MWK005D (Budget Option)
The POWHAZY MWK005D is a budget-focused Milwaukee-to-DeWalt adapter, typically priced at £17–22. POWHAZY is a Chinese import brand that has gained traction on Amazon UK through competitive pricing and acceptable build quality. The clip mechanism is basic but functional, and user reviews from occasional-use trades are generally positive.
The POWHAZY is sensible if you need an adapter for rare, one-off use and are budget-conscious. For regular use, the DL18ML offers better value. Always check current Amazon reviews before ordering, as batch quality can vary with budget imports.
Comparison Table
| Adapter | Design Type | Price Range | Build Quality | Warranty | Best For |
|---|---|---|---|---|---|
| Badaptor MIL-DEW | Snap-fit rigid ABS | £23–29 | Premium | Lifetime | Professional, daily use |
| DL18ML | Clip-on plastic | £18–24 | Solid | 12 months | Regular trades use, proven reliability |
| POWHAZY MWK005D | Clip-on plastic | £17–22 | Basic | 12 months | Occasional use, budget-conscious |
Compatible Milwaukee M18 Batteries
All current Milwaukee M18 batteries work with these adapters. The most commonly used are:
- 48-11-1860 — 6.0Ah HIGH OUTPUT, the modern workhorse
- 48-11-1850 — 5.0Ah, versatile and widely available
- 48-11-1840 — 4.0Ah, compact option
- 48-11-1830 — 3.0Ah, lightweight for low-draw tools
- 48-11-1820 — 2.0Ah, rarely used but fully compatible
- 48-11-1815 — 1.5Ah, older generation still compatible
Not compatible: Milwaukee M12 batteries are a different platform (smaller, lower voltage). Milwaukee’s newer 54V HIGH OUTPUT batteries use completely different contact geometry and cannot be adapted to DeWalt with a simple clip adapter. Stick to standard M18 batteries only.
Compatible DeWalt 20V MAX Tools
These adapters work with all standard DeWalt 20V MAX tools, including:
- Cordless drills and drivers
- Impact drivers and impact wrenches
- Circular saws and reciprocating saws
- Angle grinders
- Nailers (finish and brad)
- Rotary hammers and SDS drills
- Blowers and vacuums
Not compatible: DeWalt 60V MAX and higher-voltage tools require different electronics and cannot be powered by an 18V adapter. Milwaukee’s M12 tools (if you have any borrowed tools) use a different platform. Always verify the DeWalt tool is marked “20V MAX” on the case.
Important Limitations
No reverse charging: Adapters work for tool use only. You cannot charge a Milwaukee battery in a DeWalt charger with an adapter attached. DeWalt chargers are programmed for DeWalt battery electronics and will not recognise Milwaukee batteries. Always use your Milwaukee charger for Milwaukee batteries.
Height and fit: The extra 15mm can occasionally be problematic in tight spaces—narrow tool bags, van shelving, or scaffold-mounted tool trays. Test fit before committing to a job where space is confined.
Use 20V MAX tools only: Do not attempt to use these adapters on DeWalt 60V MAX tools or older cordless models. The adapter delivers 18V nominal, which is insufficient and unsafe for higher-voltage tools. Always check that your DeWalt tool is marked “20V MAX” on the case.
Contact wear and maintenance: Every connection and disconnection slightly wears the internal contacts on the adapter and the spring terminals on the battery. Periodically inspect for black oxidation on the contact points or visible cracks on the plastic body. Replace the adapter if contacts become heavily corroded or the clip mechanism loosens.
Frequently Asked Questions
Will my Milwaukee M18 battery work in a DeWalt 20V MAX tool with this adapter?
Yes. Both platforms are 18V nominal, so they’re electrically compatible. The adapter provides the correct mechanical interface. As long as the adapter is in good condition and contacts are clean, your Milwaukee battery will work as reliably in a DeWalt tool as a DeWalt battery would.
Can I charge my Milwaukee battery in a DeWalt charger with the adapter?
No. DeWalt chargers are specifically programmed for DeWalt battery packs and electronics. The adapter does not supply charging signals, and DeWalt chargers will not recognise a Milwaukee battery, even with an adapter. Charging requires the correct charger for your battery brand—always use your Milwaukee charger.
Do these adapters work with DeWalt 60V MAX tools?
No. DeWalt 60V MAX tools are designed for much higher voltage and amperage. An 18V adapter will not safely power a 60V tool. Do not attempt this—it’s a safety risk to both the tool and yourself. Use these adapters only on standard 20V MAX tools.
Will the adapter work with all Milwaukee M18 batteries, including older ones?
Yes. Milwaukee has maintained M18 battery interface compatibility for over a decade. Even older 48-11-1820 and 48-11-1815 batteries will work with these adapters. The only Milwaukee batteries that won’t work are M12 (different platform) and the 54V HIGH OUTPUT (completely different system).
Which adapter should I choose for professional daily use?
The Badaptor MIL-DEW at £23–29. The lifetime warranty is valuable if you use the adapter daily across multiple jobs and teams. It’s a one-time investment that you’ll get your money back on after a few months of regular use compared to replacing budget adapters.
Can I leave the adapter on my battery when it’s in storage?
Not recommended. Leaving the adapter attached exposes the tool’s contact points to dust, moisture, and corrosion. Remove the adapter after use and store it separately in a clean, dry place. This also reduces unnecessary wear on the adapter’s clips and the battery’s spring terminals, extending both components’ lifespan.
How much extra height does the adapter add?
Approximately 12–15mm. This is rarely problematic, but it can affect fit in tight spaces, narrow tool bags, or when placing the battery in restrictive compartments. Always test fit your specific tool before committing to overhead work.
Related battery platforms: Milwaukee M18 Battery Compatibility | DeWalt 20V MAX Battery Compatibility
