Not a problem that most people will in any way relate to but worth a try.. Basically every winter my iPhone (doesn't matter what model) will be useless within an hour of cycling around or below 0 degrees (celsius). I keep it in my back jersey pocket. It pops back up to almost full charge when I get back home. Simply the nature of how these batteries perform at extreme temperatures. The watch would be on your wrist however so do you think it'd do better in colder temperatures? On the other hand it would be be getting blasted with cold air, whereas the phone has some wind protection being in the back jersey pocket. Long shot but anyone have any experience with this? Was thinking to get an LTE Apple watch for myself and use it for emergencies. Would be lighter and less expensive too if I wiped and trashed it.