DM18RL Battery Adapter for Ryobi 18V Power Tools, Adaptor Convert for Dewalt & for Milwaukee M18 Convert for Ryobi 18V Power Tools: Amazon.co.uk: DIY & Tools
Adapter for Ryobi 18V Battery Used on Dewalt 20V MAX Power Tools | eBay
DeWalt Battery Adapter to Ryobi – Power Tools Adapters
DeWalt 18v battery adaptor to Ryobi Drill/Grinder/Driver/Hammer/Saw/Nailer | eBay
Dewalt XR 18v Battery Adaptor to Ryobi One+ Tools – Your ToolBox