Not only have I noticed that cold battery phenomenon but my batter life in general has been awful.
I've been getting the widely reported 30% to 0 then back to 50% when I leave it off for a while and turn it back on. By all accounts it is a 10.1.1 or 10.2 or whatver ios issue and that it can be potentially fixed by doing a complete reset of the phone and new install of the software but that sounds like a huge pain.
But I've also noticed that my phone drains battery way worse than when I first got it a few months ago (off a CPer used). I could leave it for what seemed like days with the only charge it would get is while plugged into my car for my am/pm commute and the battery would barely decrease at all. I don't use it a ton, mostly just to play music in car and at work.
Now, even if I just leave it sitting not playing music, it will decrease by 2-5% per hour. I go to bed with it at 70% and wake up and it is at 50%. Bizarre. I really hope it is the ios and an update will fix it because it is annoying. No way the battery life degraded this much in a few months.
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