Batteries hold less charge and discharge quicker when cold so much shorter flight time. Keep batteries warm inside coat pocket until ready to fly. Not harmful in the long run since cold exposure so brief
I did a flight today in -10 °C / 14 °F. I had no problems whatsoever, except I got very cold on my hands This is my first post and would like to use this opportunity to thanks for a good community / forum.
Thanks for the additional info. I'm impressed that tello can withstand -23. I'll try it next time.