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DM18RL Adapter Converter, Battery Adapter for Dewalt for Milwaukee M18 18V/20V Lithium ion Batteries Convert to for Ryobi P108 18V Li-ion NI-CD NI-MH ABP1801 Battery, with USB Port - - Amazon.com
US & Canada ONLY* Milwaukee Battery Adapter to Ryobi One+ 18v One+Tools Power | eBay
Surebonder Ryobi to Milwaukee Battery Adapter | Prime Industries