-3 or -4 meh... I won't see anything that warm for another month and a half. Well...that may not be true but it sounds good. At those temps I don't even think about it being cold. As I've mentioned in some other thread, I've flown at -20F and then checked the battery temp readings and it doesn't go below 65F or so after starting at room temp. The flights are relatively short, the battery has a fair bit of mass and as it flies the battery heats up so cold temps really don't make much difference to the drone other than considerations of condensation freezing and causing problems. Regardless of that I still fly very conservatively once it gets below -10F. I try to come back with 15% or more of battery life which is why I have 5 batteries for all of my drones except the FPV for which I have 6.