Amazon.com: for Dewalt & for Milwaukee to Ryobi Battery Adapter, Fit for Dewalt 18v-20v & for Milwaukee 18v M18 Lithium Batteries, DM18RL Converter use for Ryobi 18v ONE+ Cordless Power Tools :
Dual 18v battery adapter for 40v Ryobi tools from JPElectron.com on Tindie
Ryobi Battery Adapter to DeWalt – Power Tools Adapters
DeWalt Battery Adapter to Ryobi – Power Tools Adapters
For Dewalt 20V Battery Converter to For Ryobi 18V CORDLESS PLUG Battery Adapter | eBay
Ridgid To Ryobi 18V Battery Adapter – Badaptor - Badaptor
Ryobi to Dewalt Battery Adapter - Powuse
Surebonder Ryobi to Dewalt Battery Adapter — Keco Tabs
Dewalt to Ryobi battery adaptor - YouTube
DM18RL Battery Adapter for Dewalt for Milwaukee 20V/18V Li-Ion Battery Convert to for Ryobi 18V P108 ABP1801 Battery - Amazon.com
Amazon.com: CELL9102 Battery Adapter for Dewalt to Ryobi Battery Adapter, Convert Dewalt 20V Llithium Battery DCB205 DCB207 to Ryobi 18V One+Battery P107 P108, with 5V 2.1A(Max) USB Charge : Tools & Home