M18V18 Battery Adapter Converter for Milwaukee M18 18V Lithium-ion Battery to Milwaukee V18 18V NI-
Amazon.com: 1x Adapter Fits Bauer 20v MAX Cordless Tools Compatible with Milwaukee M18 (Not Old V18) Red Lithium Batteries- Adapter Only : Tools & Home Improvement
Milwaukee M18 18-Volt 175-Watt Lithium-Ion Powered Compact Inverter with 5.0 Ah Battery 2846-50 - The Home Depot