Hi. I,m brand new to the hobby.  Just bought the Mavic2 Zomm.  Not tech savvy at all but things seemed to be going well until I tried to charge the controller.  Used the adapter to plug the usb cable into the side but it does nothing and the screen just shows batt 2 pay when I push the button.  Has been charging for about 1/2 hour.  Am I just doing something stupid?