Since I got my 1st Phantom last March, I have never flown in winter. I'm sure there are great videos to be filmed. I have 1 worry though. This would be a question for the veterans here. Let's say it's 10 degrees outside. If I fly up to say 500 ft, how cold is it up there. Let's make up a number and say it's -20 degrees f. Would the battery freeze and the bird drop from the sky?