Amazon.com: JJXNDO for Dewalt 20V to 18V Battery Adapter, 2-Pack DM18D Upgraded Version DCA1820 Converter for Dewalt 18V/20V & for Milwaukee M18 18V Battery to Work for Dewalt 18V Nicad & NiMh
Battery Adapter for Dewalt 18V/20V MAX Convert to Milwaukee M18 18V | Wish
DeWALT 20V MAX* Battery Adapter Kit for 18V Tools (2-Pack)