I am in same situation as you have described in your post. About two weeks ago I had an aftermarket battery on my Maverick pro not properly secure on the one side and disconnect me well 900 feet up. (I’m 99% confident that was the issue). I was able to recover drone, not the battery. Snapped ribbon, just ordered replacement for that and installed myself. turned on drone and saw a small bit of smoke come out top front because I did not have that section of the shell clipped in on drone. Got red error message for a vision sensor error left and right side. I’m going to calibrate drone, providing that I don’t get any errors in that process, I’ll test again. I had no picture or control coming back from gimbal