Hm…somewhere, i think i read something about how DJI ESC limit current of ESC to 30A…i don’t know if this is relevant…
Also,you can try old trick with connecting + and - (red and black on your PDB)before changing LiPo
BE SURE NO BATTERY IS CONNECTED
Also,please give us some photo…you know how they say;one picture 1000 words…i could add;one video-1000 pictures…
This guy also have problems with S1000 maybe you can help each another by comparing data
http://discuss.ardupilot.org/t/3-4-3-on-pixhawk-2-1-autotune-issues/13601