I'm kind of new in the electric things and I'm also a teenager so I don't have that much knowledge. I learned about Arduinos and very basic stuff so I would like to do this as kind of a project to understand some more.

I have a lot of powerbanks at home that we don't charge so all are drained all the time. I wanted to take them all and connect them into one so it would be the only one which needs to be charged.