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
Einhell Power X-Change 18-Volt 3.0-Ah Lithium-Ion Starter Kit, Includes Battery and Fast Charger - - Amazon.com