Batteries get pretty warm, but not so hot that you can't touch them. As for transferring files, you need to either put the drone on a AC Vent or box fan or something. Best if you get a Lightning port SDCard reader and transfer that way. The drone isn't meant to be powered up unless flying normally. Setting in place will cause it to get very warm and most probably will cause damage.I've only had my Mini 2 for a few days and noticed since day 1 that the drone/battery area gets very warm/hot in use, also while transferring photos from drone to iPhone. I've measured temps as high as 138.2°f and average temps between 125° and 130°. Is this normal?