Greenworks 40V to DeWalt 20V Battery Adapter

Use your Greenworks 40V batteries on DeWalt 20V MAX cordless tools, without buying into a second battery platform. Your Greenworks 40V battery is 40V and a DeWalt 20V MAX tool expects 20V. The converter holds the output at the tool’s level for as long as the battery lasts. The molded ABS housing keeps it light and hard-wearing, and pure copper contacts keep current delivery steady. This helps you get the most out of your existing battery system while avoiding the cost of another set of batteries and chargers.

Specifications

• SKU PTA-GRE40-DWM20
• Fits this battery Greenworks 40V (Lithium-Ion)
• Battery voltage 40V
• Runs these tools DeWalt 20V MAX (Lithium-Ion)
• Tool voltage 20V
• Housing ABS (Injected)
• 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 164 g (5.8 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 delivery
• 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 DeWalt 20V MAX compatibility

It works in one direction only: Greenworks batteries powering DeWalt tools. For the opposite pairing, see adapters that run on DeWalt 20V MAX 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 DeWalt 20V MAX batteries.

Important charging and safety information

This adapter is for powering cordless tools and nothing else. It cannot charge Greenworks or DeWalt 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.

Before you buy