I flew my Avata today. It was a chilly -40F and the battery needed to be calibrated for distance according to an alert so I flew it till the battery was under 10% as required and it force landed. No problem. I put in a fresh battery (room temp) and tried to take off and got a message "IMU warming up" and it would not let me start the motors. Well well...I guess THAT is some kind of hard limit for temperature!