Battery Adapter for Dewalt 20V for Milwaukee 18V Batteries Convert to for Ryobi 18V Batteries,for Ryobi Power Tools(Adapter Only): Amazon.co.uk: DIY & Tools
Badaptor - DeWalt to Milwaukee 18V Battery Adapter | DIY at B&Q
Battery Adapter for Dewalt/Milwaukee 20V/18V to Milwaukee M12 12V Li-ion Battery | eBay