Dewalt DCA1820 slide on lithium battery to old post style ni cad battery adaptor | eBay
DEWALT Battery Adapter 18V to 20V, For Drills, Sanders and More, Charger Not Included, Bare Tool Only (DCA1820) - Amazon.com
AEG (Ridgid) 18V battery - Old DeWalt 14,4V Tool adapter ( Jadapters ) | eBay
18v Nicad Lithium Adapter | Battery Adapter | Adapter Dewalt | Power Tool Accessories - Power Tool Accessories - Aliexpress
Amazon.com: DM18D Converter for DeWalt 18v to 20v Battery Adapter,for Milwaukee M18 18v Batteries Adapter, Convert to DC9096,fit for DeWalt 18v XRP Ni-Cad Cordless Tool,Upgraded Version of DCA1820,with USB Port : Electronics
DEWALT 20V MAX Lithium-Ion Battery Adapter for 18V Tools DCA1820 - The Home Depot