DeWalt 20V to MacNaught 18V Battery Adapter (Pump, Grease Gun)
239,00 kr
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DeWalt 20V to MacNaught 18V Battery Adapter (Pump, Grease Gun)
239,00 kr
Taxes included.
kr 23.00 Shipping to DenmarkZero customs fees. Zero surprise taxes.
Safety feature
Built-in BMS Protection
Integrated Battery Management System (BMS) helps prevent battery over-discharge and improves safety.
Use your DeWalt 20V MAX batteries on MacNaught 18V cordless tools, without buying into a second battery platform. Built with an injection-molded ABS battery interface, a 3D-printed ABS tool socket for a close fit, and pure copper contacts. It removes the need to keep separate batteries for different platforms, which saves money and simplifies the workflow. It also carries battery protection electronics (BMS) inside.
Specifications
- SKU
- PTA-DWM20-MNA18
- Fits this battery
- DeWalt 20V MAX (Lithium-Ion)
- Battery voltage
- 20V
- Runs these tools
- MacNaught 18V (Lithium-Ion)
- Tool voltage
- 18V
- Housing
- ABS
- Terminals
- Copper
- Current rating
- 40A continuous (80A peak at 18VDC for up to 2 seconds)720 Watt continuous at 18V nominal
- Internal wiring
- 5 mm²
- Weight
- 109 g (3.8 oz / 0.24 lb)
- Colour
- Yellow, Black
- Operating humidity
- 5–95% RH
- Operating temperature
- -10 °C to 50 °C (14 °F to 122 °F)
- USB port
- No
- Built-in BMS protection
- Yes
- What's in the box
- Battery Adapter
- Warranty
- 12 months after the date of deliveryMore details
- Revision
- Revision 01 (released on December 27, 2025)
Why choose this adapter
- A Battery Management System inside the adapter cuts power before the battery is drained too far — protection your battery may not have on its own.
- Solid copper terminals, so less of the current is lost as heat.
- 5 mm² internal wiring, rated for 40A continuous with 80A 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.
DeWalt 20V MAX and MacNaught 18V compatibility
It works in one direction only: DeWalt batteries powering MacNaught tools. For the opposite pairing, see adapters that run on MacNaught 18V batteries.
Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the DeWalt 20V MAX platform and that your tool takes MacNaught 18V batteries.
Important charging and safety information
This adapter is for powering cordless tools and nothing else. It cannot charge DeWalt or MacNaught 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 DeWalt 20V MAX battery.
How it works
-
1. Use the battery you own
Any compatible DeWalt 20V MAX battery you already have.
-
2. Slide on the adapter
It goes where the original MacNaught 18V battery sits.
-
3. Click in and work
No tools, no wiring, no modifications.
DeWalt 20V MAX to MacNaught 18V — Common Questions
My battery says 20V. Can it run a tool rated differently?
Yes, and they are closer than the labels suggest. 20V is what a DeWalt 20V MAX battery measures off the charger with no load; 18 V is what it holds in use. MacNaught 18V tools are built around 18 V. The two numbers describe the same class of battery, which is why the adapter works rather than merely fits.
Will this fit my other DeWalt batteries?
Only DeWalt 20V MAX batteries. DeWalt also sells DeWalt 12V MAX, DeWalt 18V Ni-Cd, 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 MacNaught 18V tool run as long on a DeWalt 20V MAX battery?
Runtime comes from the battery, not the adapter — a 5.0Ah DeWalt 20V MAX 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 DeWalt 20V MAX battery or my MacNaught 18V tool?
Used with undamaged, compatible equipment it is not expected to. This adapter has its own Battery Management System, which cuts power before the battery is drained too far, so it protects the battery even where the battery has no protection of its own. Stop using it if the adapter becomes unusually hot, the contacts look damaged, or the tool behaves oddly.
Can I charge through the adapter?
No, and it should never be attempted. The adapter carries power one way only, out to the MacNaught 18V 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 DeWalt 20V MAX battery off the adapter and charge it on its own charger.
Does it work with third-party DeWalt 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 MacNaught 18V 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 MacNaught 18V tool?
109 g (3.8 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.