Is there a way to charge the DJI Mavic Mini controller and use it at the same time? I mean for the drone I have multiple battries and swap them out when one runs out. But whats the point if the battery on the controller cant be changed, as I wont be able to fly it?

Hi!
You might be better off posting your question in the 'products' section of this forum.
That is way more active.
Just create a new thread here : https://forum.dji.com/forum-129-1.html and select the right category / subcategory.