May fully charged batteries be left in the charging hub or must the hub be disconnected from power and the batteries in it removed? (DJI Mini 3 pro)

The charging hubs and batteries have a built in cut off but I don't take any chances and will not leave them charging over night or if I am not in the house, once the are fully charged, I unplugged the charger

Here you are in Mavic 3 forum.

But if you disconnect the charger cable there will be no problem at all...

Hi there. Thank you for reaching out. The DJI Intelligent flight battery does support overcharging protection however, we highly recommend removing your batteries from the charging hub after fully charging them and placing them in a bag or a safe storage box. Should you have other inquiries, please don't hesitate to reach us. Thank you for your valued support.