DEWALT Battery Adapter 18V to 20V, For Drills, Sanders and More, Charger Not Included, Bare Tool Only (DCA1820) - Amazon.com
Dewalt 18V Batteri LI-ION 5.0 Ah SLIDE-IN DCB184
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: 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 20V Max 1.3Ah and 18V Nano Phosphate Teardown
Review: 20 To 18 Volt battery Adapter For Dewalt Tools - YouTube
DEWALT 20V MAX Compact Lithium-Ion 2.0Ah Battery Pack DCB203 - The Home Depot