Amazon.com: DM18RL Battery Adapter for Dewalt to Ryobi Battery Adapter, Convert Dewalt 20V Llithium Battery to Ryobi 18V P107 P108 Battery with 5V 2.1A MAX USB Charge : Tools & Home Improvement
Battery Adapter for Ryobi 18V Cordless Tools Uses DeWalt 20V MAX XR Li-Ion Batteries, with 5V 2.1A MAX USB Charge Port-US Stock - Amazon.com
For Dewalt Bauer Hercules Li-ion Battery to Ryobi 18V Tools Adapter Converter | eBay