It's been quite cold here in the Northeast recently. Yesterday night I forgot that it was extremely cold, and I accidentally left my HTC One in the car for 2 and a half hours while it was maybe about -5F or lower. (-20C) When I got back, I realized my mistake and pressed the power button to see if my baby still worked. Looking back, that was probably a stupid idea, as condensation could've formed in my phone. It wasn't powered on because the Li-Ion battery had frozen up. It said battery had no charge, so I heated up the phone next to my car heater vent, probably also a stupid idea. It's been a day now, I'm not sure if my battery has lost any capacity or my LCD has somehow messed up, but everything seems ok. I know you can permanently screw up phones once they reach like -40 or -50F, but would anything like -5 be cold enough to damage my phone?