You’ve built your cordless arsenal around Makita 18V LXT — possibly because of their excellent runtime, their reliable Li-ion cells, or simply because you prefer their ergonomics. But now you’ve spotted a specific Milwaukee M18 tool that would fill a gap in your collection, and buying an entire new battery set feels wasteful. A Makita to Milwaukee adapter lets you mount your existing LXT batteries into M18 tools, effectively giving you access to Milwaukee’s specialist tool range without the investment.
The reality is that Makita and Milwaukee tools serve almost identical trades — both platforms have drills, impact drivers, grinders, and saws. But they each have niche tools the other doesn’t. An adapter is a pragmatic way to borrow from the other ecosystem without committing to it. This guide covers the adapters available in the UK, their real-world performance, and whether this makes financial sense for your situation.
How the Adapter Interface Works
Both Makita LXT and Milwaukee M18 batteries are 18V nominal voltage, but they feature completely different connector designs. The Makita LXT connector is a three-pin interface; the Milwaukee M18 uses a spring-loaded two-pin + frame design. An adapter accepts a Makita battery on one side and presents a Milwaukee-compatible connector on the other side. The voltage passes through unchanged, so there’s no electrical conversion — just mechanical translation.
The adapter adds roughly 2–3 cm of depth to the tool, which is noticeable on compact drills and impact drivers. In practice, this means tight-fitting holsters and ceiling work become slightly more awkward. Most importantly, like all battery adapters, this is a passive mechanical device — it does not include smart battery cell monitoring. You’ll need to use your Makita charger to recharge the battery; Milwaukee chargers won’t recognise an adapted Makita battery.
Best Makita to Milwaukee Adapters
Badaptor MAK-MIL — Most Reliable Choice
The Badaptor MAK-MIL is engineered specifically for this direction and sets the standard for quality. It uses precision-injection-moulded connectors with reinforced contact points, designed to survive hundreds of insertion cycles without degrading. If you’re rotating this adapter between several tools on a regular basis, Badaptor’s durability matters. The connector geometry is tight enough to prevent wobble but smooth enough not to damage your battery’s connector pins.
Badaptor includes a 2-year warranty and stocks in the UK, so you’re not waiting 3 weeks for shipping from abroad. At £23–29, it’s the premium option, but professionals running job sites find the durability and reliability worth the extra cost. You won’t be replacing this adapter every 18 months like you might with cheaper imports.
Buy Badaptor MAK-MIL on Amazon
MT20ML Reverse Variant — Budget Option
Generic adapters marketed as “MT20ML” in reverse configuration (accepting Makita, outputting Milwaukee) are widely available on Amazon UK for £17–22. These are commodity products with significant batch variance in quality. Some users report 2+ years of reliable service; others report loose connections within weeks. The connector design is adequate, not excellent — you’re trading durability for cost savings.
The MT20ML reverse is sensible if you’re using the adapter infrequently — maybe you’ve bought one Milwaukee specialist tool and will use the adapter only a handful of times before setting it aside. For light, occasional use, the budget option works. For regular site rotation, invest in Badaptor.
Buy MT20ML Reverse Adapter on Amazon
KUNLUN Compact — Lightweight Alternative
The KUNLUN adapter takes a different design approach: instead of a boxy housing, it uses a slimmer profile connector that projects less from the battery. At £16–20, it’s the cheapest option and adds minimal depth to your tool. If working in tight spaces is a priority — overhead ceiling work, between studs, or in roof voids — the KUNLUN’s compact form is a genuine advantage.
The trade-off is that the slimmer housing provides less grip surface and slightly less connector reinforcement. Insertion and removal are a touch harder, and connector wear happens slightly faster. But if you’ve identified a specific use case where tool depth is critical, the KUNLUN solves that problem affordably.
Buy KUNLUN Compact Adapter on Amazon
Adapter Comparison Table
| Adapter | Input Battery | Price Range | Profile | Warranty | Best For |
|---|---|---|---|---|---|
| Badaptor MAK-MIL | Makita 18V LXT | £23–29 | Standard (2–3 cm) | 2 years | Professional use, frequent tool rotation |
| MT20ML Reverse | Makita 18V LXT | £17–22 | Standard (2–3 cm) | None stated | Occasional use, budget-conscious |
| KUNLUN Compact | Makita 18V LXT | £16–20 | Slim (1–2 cm) | None stated | Tight spaces, overhead work, depth-critical applications |
Compatible Makita 18V LXT Batteries
Any Makita 18V LXT battery will work with these adapters. The full lineup includes:
- BL1860B — 6.0Ah, flagship capacity, premium runtime
- BL1850B — 5.0Ah, the standard workhorse battery
- BL1840 — 4.0Ah, older generation, still common in the field
- BL1830B — 3.0Ah, compact, ideal for overhead work
- BL1820B — 2.0Ah, lightweight backup
Important limitation: Do NOT use Makita 40V XGT batteries or Makita G-Series batteries with these adapters. The XGT and G-Series use entirely different connector geometries and higher voltage (40V), making them incompatible. Stick to the LXT lineup above.
Larger batteries like the BL1860B (6.0Ah) deliver excellent runtime when mounted in Milwaukee tools, often matching or exceeding the runtime of native M18 batteries. However, the weight penalty is real — a BL1860B is noticeably heavier than a 5.0Ah M18 equivalent, which matters for grinder work, impact driver fatigue, or overhead jobs.
Key Limitations You Should Know
You cannot charge through the adapter. This is the defining limitation of battery adapters. The adapter is a mechanical interface only — it has no smart communication pathway. Your Makita charger cannot recharge an adapted battery while it’s mounted in a Milwaukee tool. You must remove the battery, disconnect the adapter, and charge it in your Makita charger. This isn’t a problem if you already own Makita charging infrastructure, but it does mean you can’t walk onto a mixed-platform job site and top up on Milwaukee chargers.
Milwaukee’s heaviest-duty tools may strain the adapted battery. While Makita LXT batteries are excellent, Milwaukee’s professional-grade impact wrenches and rotary hammers in demolition mode demand very clean, consistent power delivery. An adapted Makita battery introduces a tiny amount of contact resistance through the mechanical interface. For everyday work, this is irrelevant. For marathon demolition or running massive angle grinders constantly, native Milwaukee batteries are the safer choice.
Connector wear is cumulative. Every insertion and removal places a tiny amount of mechanical stress on both the adapter connector and your battery’s connector pins. Over time (typically 1–3 years of regular use), you’ll notice the fit becoming looser. This is why professionals prefer quality adapters — they slow the degradation process. For casual users, it’s a non-issue.
The extra depth matters in confined spaces. A 2–3 cm extension is genuinely noticeable when working in wall cavities, roof voids, or between joists. Measure twice, buy once — if your work regularly happens in tight spaces, consider the KUNLUN’s compact profile.
Frequently Asked Questions
Can I use my Milwaukee charger to recharge a Makita battery inside a Milwaukee tool?
No. The adapter is a passive mechanical bridge. Milwaukee chargers include smart-cell recognition that reads the battery’s internal chip. An adapter doesn’t transmit this data, so the charger won’t recognise the Makita battery as valid. Always remove the battery from the Milwaukee tool, take off the adapter, and charge it in your Makita charger.
Will the adapter damage my Makita battery?
No. Both systems operate at 18V, so there’s no electrical stress on the battery. However, the connector pins on your Makita battery will experience gradual wear from repeated insertions. Quality adapters with smooth connector geometry (like Badaptor) minimise this wear. Cheap adapters with rough edges can accelerate pin degradation.
How long do these adapters last?
It depends on quality and use frequency. A Badaptor in regular professional use will last 2–3 years before connector looseness becomes annoying. A cheap generic adapter in light DIY use might last 1–2 years; in heavy use, it could fail within a year. Budget accordingly.
Why would I choose this over just buying Milwaukee batteries?
Cost. A single Makita-to-Milwaukee adapter costs £16–29. A new Milwaukee battery (5.0Ah) costs £60–80. If you’re buying one specific Milwaukee tool to fill a gap in your Makita collection, an adapter is a fraction of the price of adopting a new platform.
Related Guides
For the complete Makita 18V LXT tool and battery compatibility database, see our Makita 18V LXT Battery Compatibility guide. To understand the Milwaukee M18 platform in full, read our Milwaukee M18 Battery Compatibility reference. For other cross-brand adapter options, visit our power tool battery adapter hub.
