Hi, i am a came tv mini 2 user... I was using it with my panasonic fz1000.. and suddenly i heard a pop! smoke from the controller board... bad smell and non working gimbal.
I opened when i got home, and saw the one of the tandalum capacitors burned. I ordered and replaced him with the exact number.. then no power at all... And i noticed that the batteries where moving a little bit inside... I opened the tube and saw the burned suspension thing..
I'm afraid you've had a bad short, in these cases it's no easy to know the exact reason, and the simple substitution of the capacitor may not fix the board... I suggest to power the board externally, by connecting 12 V cc to the + and - pins of the board, and see if the board turns alive. Then of course you have to fix the burned battery holder... hope it helps