Drone battery does ok in winter, maybe losing 2 min. in flight time. Sc2 is different. The sc2 controller loses power quickly. That is until I taped 4 hand warmers on the sc2 to keep battery warmer. It works great, Plus it keeps fingers warm too.
Seriously, that Happened to me too. Try taping hand warmers to the controller when it's real cold. If you are in Alaska, I bet all the stores have them, and here they are .. 25 cents7 degrees F - 19:33 with 6% on landing. That was too close.