Went for a 2hr drive this morning to do some flying and take pictures. I had packed my Mavic last night in its case, witch is a good soft back pack case and is made for it. When we arrived this morning I went to get the drone out and found it turned on and hot. I pulled the battery let it cool off and put a fresh battery in and did my picture taking. In looking at it it would be hard to turn on in the case and if it had happen when I was packing it last night it would have been run down. I don't know what happen, but I will never travel again with the battery in the drone.