Amazon.com: Milwaukee Battery Adapter, 2 Pack Power Wheels Adapter for Milwaukee M18 Battery 18v Power Wheels Adapter M18 Adapter 18v Battery Adapter for Power Wheels Dock Power Connector with 14 Gauge Robotics :
HOW TO make an 18v NiCad to 18 volt lithium ion battery adapter for Milwaukee tools - YouTube
USA MADE Milwaukee M18 Battery Adapter 18v Connector Dock Holder Mount Injection Molded - - Amazon.com
1x Milwaukee M18 Li-Ion Battery To Ridgid 18V Cordless Tool Adapter-Adapter Only | eBay
Amazon.com: BTRUI for Dewalt 20V to Milwaukee 18v Battery Adapter, DL18ML / DW18ML Battery Adapter, Put for Dewalt 20V Battery Convert to for Milwaukee M18 18V Tool : Tools & Home Improvement