This topic has already been discussed. I will re-iterate it again though... Warranty is VOID when flying out of SOLOS spec sheets of 0c - +45c Be Aware of this. If you crash (Like I did) and send it the logs and video, if they see snow in the video they will look at the temp. I was flying in -8. They told me motor pod 3 had a failure and was NOT covered due to exceeding normal operating temps. That being said I pulled my own logs and found that it was a compass error, and that I didn't Pre-Cal my compass before flight. ( I was flying away from my normal flying location).
As well good tips were made. When flying in the cold. Remove your battery. let the copter sit in the cold for at least 15 minutes to chill out. The pixhax2 barometer needs to adjust as its used to sense elevation. If you bring it out to fast from warm to cold, it may not calibrate properly upon power up!
I still get 17 minutes in the cold. And when you start pulling current from the battery it warms up itself. No need for battery blankets.
Fly safe guys,
peace!