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 DC927 18 Volt Cordless Hammer-Drill Battery & Charger DW9116 | eBay
DeWalt DC927KL 18V Hammer Drill Preview
DEWALT DCD999 20-Volt MAX Brushless Cordless 1/2 in. Hammer Drill/Driver
Amazon.com: Swidan 18v to 20v Adapter DCA1820 for Dewalt 18V Tools,Convert Dewalt 20V MAX Compact Lithium Batteries DCB201 DCB203 to 18 Volt NiCad &NiMh DC9096 DE9096 DW9099 Battery : Tools & Home
Dewalt 5 3/8" Circular Circle Trim Saw 18v bundle DW936 DC927 DC9096 DC9310 | eBay
Dewalt DC927 Replacement Battery
Biswaye DCA1820 Adapter 18V to 20V Replacement for Dewalt, Compatible with Dewalt 20V Lithium Battery DCB206 DCB207 to 18V XRP NiCad NiMh Battery DC9096 DW9096 DC9098 DC9099 DW9099 - - Amazon.com
For Bauer 20v Battery Adapter Converter To Dewalt 18v Xrp Series Cordless Ni-cd Battery Tools - Power Tool Accessories - AliExpress