After the light starts flashing red, then what happens....every time it has gone red I have plenty of time to land as long as I am close. I was flying fpv tonight and couldnt see the light flashing red when the battery was going dead. Luckily I was landing when the phantom began to come down on its own. So, my question is, after the light starts to blink how much flight time is left and what does the phantom do?