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
Amazon.com: Power Wheel Battery Adapter for Dewalt 18v-20V Battery, Power Connector 14 AWG Robot Power Convertor for DIY Ride On Truck, RC Toys : Everything Else
Review: DeWalt Battery Adapter for 18 Volt tools to 20V MAX Batteries — AZ DIY Guy