I have had my 5 since launch date and I will admit, I use the sucker from time to time (not as much as a normal person). However, every little questionable instance I rack my brain over because of my slight diagnosed OCD condition. Without any usage on this sucker in 2-3 days and it just in sleep mode and it was at 100% battery life late Saturday night I realized it just read 79%. 21% in a few days with basically the email app, messaging, phone and clock app running. Is that normal? I found a post on apple.com about managing battery life more so I went in and changed a few settings. So first question, is the above normal? Onto the second question, all this made me realize that when I am on one of my out of town trips via a train or bus and using my phone more than normal when it reaches 15-20% it tends to show the red battery icon and turn off by itself. Usually it allows me to turn on to only show that icon again until I plug it in. I don't recall it ever completely turning off for me but it could have at one point I just can't remember. Anyways, looking on line it says it may need a battery calibration where you let it completely drain and then completely charge up. Second question, should I worry about the above? What I read online seems to lean towards it doing that when its at 1-10% (completely turning off that is, and like I said I think it happened once before but I cannot be certain; hasn't happened recently and I never even let it get down to that, I usually charge at like 50% lol) Thanks in advance for reading this. Seriously, I doubt this gets any sort of reply but I was just wondering. Even with minimal usage on this thing (I mainly use as an alarm clock), I have grown fond of it.