Mine come into the shop which is fully heated. The fuel system is kept wet with fuel. I start it every month on the bench, run it a minute and then stuff it back on the shelf. All my planes come in out of the cold. Significant changes in temps cause condensation on metal. Condensation results in corrosion. If you are going to energize very cold electronics, bring them into a heated environment to warm up first. Thermal runaway on ICs can weaken them. Not real good to put a load on a very cold battery.