Ryobi USB charger
Yet another Ryobi USB charger. Others have made this but I made my version because I wanted a smaller, more compact unit.
Many different devices can be used, just make sure it's a 12-24V version.
You'll need four #4 wood screws. For the battery contacts, I just used some regular spade terminals and bent them up.
The 3mf model has all three components in the one file. If you flip them upside down, you can minimize using supports.