I strongly advise you to buy a GPS tracker (or a cheap bluetooth version), write your phone number on board and run it only in an open area, preferably a large field, without trees and tall grass. Before flying off, I advise you to look at the behavior and try to return home, if inadequate actions appear, turn off the return home, GPS and calibrate, it is advised to remove mobile phones, metal objects, and is not near high-voltage power lines. You can buy antennas to put and increase the distance of reception / transmission. I advise you to immediately take a second battery.