I had this same issue just Saturday. I took off using a battery from the flight the previous day. It started the flight at 55% and 21 seconds into the flight, the first 15 were spent hovering and getting my position correct before forward flight. Aircraft reached 41 feet high and 25 feet away and motors just shut off, all power was lost. Aircraft hit the ground on top of some tall thick weeds so that helped a lot but still broke the camera off and bent one of the land gear. I haven't checked for any other damage as I was a little upset it happened. I received no warning from the app and all functions were normal. Below is a screen shot from my flight log. If anybody else has experienced this type of issue and had a positive outcome from DJI fixing their aircraft under warranty please let me know.