RE: REPLACING BATTERY
I have no idea what the jumper would be, but everything is soldered in place and it wouldn't be worth it to me to undo the solder and redo it. Is there a battery that would give more flying time that could be put in without redoing the ESC?
Photo 1) Complete ESC setup as done by manufacturer
Photo 2) Top circuit view
Photo 3) Circuit view
Photo 4) Front and bottom view
Photo 5) Front view of front connections