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Amazon.com: Badaptor Compatible with an 18V/20V Dewalt Battery used for Ryobi 18v One+ Tools : Tools & Home Improvement
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
Surebonder Ryobi to Milwaukee Battery Adapter — Keco Tabs