Amazon.com: JJXNDO 1-Pack DM18D Upgraded Version DCA1820 Converter for Dewalt 18V/20V & for Milwaukee M18 18V Battery to Work for Dewalt 18V Nicad&NiMh Battery Tool(Convert Lithium Battery to Nicad/Nimh Battery) : Tools
Dewalt DCB183 18V-20V Max Lithium Ion Battery (2.0Ah) – vertexpowertools
DEWALT 20V MAX Lithium-Ion Battery Adapter for 18V Tools DCA1820 - The Home Depot
Power Connector DIY Battery Adapter Holder Dock For DeWalt 18V/20V Max Battery – ASA College: Florida