Amazon.com: Fancy Buying Replacement Battery Adapter DCA1820 for Dewalt 18V Tools, Convert 18V / 20V Lithium Battery to NiCad/NiMH Battery, Makes The Battery can be Used for Nickel Drill and Charger :
DEWALT 20V MAX Lithium-Ion Battery Adapter for 18V Tools DCA1820 - The Home Depot
Forrat DC9098 DC9099 Upgraded 3.6Ah Replacement for Dewalt 18V Battery XRP DE9098 DE9503 DW9095 DW9096 DW9098 DW9099 18 Volt Cordless Power Tools 2 Packs (Yellow) - - Amazon.com
DeWalt XR 18V Battery 4.0Ah | Toolstation
DEWALT 20V MAX Battery Adapter Kit, 18V to 20V, 2 Batteries and Charger Included (DCA2203C) - - Amazon.com
DEWALT 20V MAX Battery Adapter Kit, 18V to 20V, 2 Batteries and Charger Included (DCA2203C) - - Amazon.com
DEWALT Original 18V Lithium Battery DIY Power Driver Variable Speed Electric Screwdriver Impact Cordless Drill with LED Light|Electric Drills| - AliExpress
Snap on 18v Nicad to Dewalt Lithium Battery Adapter - Etsy
DeWalt's 18v Battery Fits Old and New Tools - FineWoodworking