I just came across this today. Since I have a lot of Dewalt 20v Max batteries, this might be useful for me and thought I’d share.
Dewalt USB Charging Kit
You can charge the Dewalt 20v Max and Flex Volt batteries via USB-C or you can power a USB-C device using a Dewalt 20v Max or Flex Volt battery. Thinking this might come in handy during hurricane season.