Amazon.com: for Dewalt 20V to 18V Battery Adapter, JJXNDO 2-Pack DM18D Upgraded Version DCA1820 Converter for Dewalt 18V/20V & for Milwaukee M18 18V Battery to Work for Dewalt 18V Nicad & NiMh
DEWALT DC9182 18V XRP Lithium Ion Battery - - Amazon.com
DEWALT Charger for 7.2V-18V Battery, 1-Hour Fast Charging (DC9310) , Yellow - Cordless Tool Battery Chargers - Amazon.com
Review: DeWalt Battery Adapter for 18 Volt tools to 20V MAX Batteries — AZ DIY Guy