Greenworks 40V to Milwaukee 18V Battery Adapter
372,00 kr
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Greenworks 40V to Milwaukee 18V Battery Adapter
372,00 kr
Taxes included.
kr 35.00 Shipping to NorwayZero customs fees. Zero surprise taxes.
Use your Greenworks 40V batteries on Milwaukee M18 cordless tools, without buying into a second battery platform. The battery sits above the tool’s platform — 40V against 18V — so this adapter converts instead of connecting the two directly. Constructed from durable molded ABS with pure copper contacts, for a secure fit and dependable current transfer. It is a cost-effective way to get more from the batteries you have, with no second charger to maintain.
Specifications
- SKU
- PTA-GRE40-MIL18
- Fits this battery
- Greenworks 40V (Lithium-Ion)
- Battery voltage
- 40V
- Runs these tools
- Milwaukee M18 (Lithium-Ion)
- Tool voltage
- 18V
- Housing
- ABS (Injected)
- DC-DC converter
- Yes — 40V to 18V
- Terminals
- Copper
- Current rating
- 60A continuous (100A peak at 18VDC for up to 2 seconds)1080 Watt continuous at 18V nominal
- Internal wiring
- 6 mm²
- Weight
- 163 g (5.7 oz / 0.36 lb)
- Colour
- Black
- Operating humidity
- 5–95% RH
- Operating temperature
- -10 °C to 50 °C (14 °F to 122 °F)
- USB port
- No
- What's in the box
- Battery Adapter
- Warranty
- 12 months after the date of deliveryMore details
- Revision
- Revision 01 (released on August 9, 2026)
Why choose this adapter
- Injection-moulded ABS, not 3D printed — no layer lines to split under load.
- Solid copper terminals, so less of the current is lost as heat.
- 6 mm² internal wiring, rated for 60A continuous with 100A peak at 18VDC for up to 2 seconds, so a high-draw tool is not held back by the adapter.
- Covered by a 12-month warranty from the day it arrives.
Greenworks 40V and Milwaukee M18 compatibility
It works in one direction only: Greenworks batteries powering Milwaukee tools. For the opposite pairing, see adapters that run on Milwaukee M18 batteries.
Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Greenworks 40V platform and that your tool takes Milwaukee M18 batteries.
Important charging and safety information
This adapter is for powering cordless tools and nothing else. It cannot charge Greenworks or Milwaukee batteries and must never be connected to a charger of any kind. Always take the battery out of the adapter before charging, and charge it on the original charger made for your Greenworks 40V battery.
How it works
-
1. Use the battery you own
Any compatible Greenworks 40V battery you already have.
-
2. Slide on the adapter
It goes where the original Milwaukee M18 battery sits.
-
3. Click in and work
No tools, no wiring, no modifications.
Greenworks 40V to Milwaukee M18 — Common Questions
My battery says 40V. Can it run a tool rated differently?
Yes, and they are closer than the labels suggest. 40V is what a Greenworks 40V battery measures off the charger with no load; 36V is what it holds in use. Milwaukee M18 tools are built around 18V. The two numbers describe the same class of battery, which is why the adapter works rather than merely fits.
Will this fit my other Greenworks batteries?
Only Greenworks 40V batteries. Greenworks also sells Greenworks 24V, and those use a different socket — same brand, different rail and contacts, so they need their own adapter. Compare the rail on your battery with the photos before ordering.
Will my Milwaukee M18 tool run as long on a Greenworks 40V battery?
Runtime comes from the battery, not the adapter — a 5.0Ah Greenworks 40V battery lasts roughly twice as long as a 2.5Ah one, exactly as it would on its own tool. The adapter’s copper terminals and heavy-gauge wiring are there to keep resistive loss low.
Could this damage my Greenworks 40V battery or my Milwaukee M18 tool?
Used with undamaged, compatible equipment it is not expected to. Greenworks 40V batteries are lithium-ion with a protection circuit built into the battery, and it keeps working through the adapter — it stays in the battery and never moves into the adapter. Stop when the tool slows noticeably rather than running the battery flat, and stop using the adapter if it becomes unusually hot or the contacts look damaged.
Can I charge through the adapter?
No, and it should never be attempted. The adapter carries power one way only, out to the Milwaukee M18 tool — there is no charging circuit inside it. Connecting it to a charger puts the battery, the charger and the adapter at risk. Always take the Greenworks 40V battery off the adapter and charge it on its own charger.
Does it work with third-party Greenworks batteries?
Usually. What matters is the socket, not the badge: if the battery slides on and locks the way an original does, the adapter takes it and the Milwaukee M18 tool runs. Aftermarket moulding does vary, so if yours looks unusual send us a photo and we will check before you order.
How much does it add to the Milwaukee M18 tool?
163 g (5.7 oz) and a short extension between battery and tool. You notice it overhead or in a tight cabinet; on a drill or driver held normally it disappears.