I have an ip5s that was running 7.1 until yesterday. I live in NYC & its been damn cold here the last few weeks. I sometime want to take pictures of the snow in the park or whatever. I'll have my phone, it has 60-90% battery life. On many occasions over the last few weeks I can take my phone out of my jacket pocket & open the camera & by the time I take a shot or two the phone shuts itself down with no warning. I even have a very basic case on it. I know cold weather can effect the battery as it can sap its power. It's cold when this happens like 9-20F degrees but it will shut down while its in my hand. I had a ip4s & went camping in 20F degree weather. If I left the phone out for a few mins the power would go from 80% to 40% pretty fast. I put the phone in my jacket next to my body. In a few mins it was warm again & the battery power went back up again. This problem with my ip5s I thought maybe i had low battery power & the cold drained it to the point it turned off. But when I got home it was warm again. I turned it on & it had over 60% power. I've since gone out to test this issue. I make sure I have 100-80% power & each time the phone shuts down in a minute or less when out of my pocket. So questions are: Does anyone else have a similar problem? Is the ip5s just very sensitive to cold? Why would the cold drain my ip4s power but not cause it to abruptly turn off like the ip5s?