I made a custom charging case capable of charging four batteries at once : r/Dewalt
2xPower Connector DIY Battery Adapter for DeWalt 18V/20V Max Battery Holder Dock - Walmart.com
Power Connector DIY Battery Adapter Holder Dock for DeWalt 18V/20V Max Battery | eBay
DIY Dewalt 20v battery wall mount (Shop improvements) - YouTube
DeWalt Battery Holder – 48 Tools
CNC Router Files Battery Holder Charging Station for Dewalt Batteries – dryforge
Power Connector DIY Battery Adapter for DeWalt 18V/20V Max Battery Holder Dock | eBay
Amazon.com: Akocire 18V 20V 4.0Ah 5.0Ah 10-Cell 18650 Battery Case Parts Cover Replacement for Dewalt DCB200, DCB201, DCB203, DCB204, DCB205 Battery Repair DIY Kit(No Battery Cell Included) : Tools & Home Improvement
Power Wheels Adapter for Dewalt Battery 12 AWG,5 Mount Dock Holders for Dewalt 20V Battery,Easy DIY Power Connector for Kids RC Toys,Robotics,Truck Car and Work Lights - Amazon.com