Don't remember my iPhone 5 doing this pre-iOS 7 but I am noticing more and more that my battery % level seems to get stuck every now and again. I will be using my phone and the battery % shows 48% (as an example). I use my phone for a good 5 - 10 minutes (in that time, my phone would typically lose at least 1%) but the battery stays at 48%. Then, I would carry on using my phone (after the initial 10 minutes) and I glance at my battery and it has then dropped from 48% to 35% in the space of a less than 1 minute?! Its like the battery gets stuck at a certain level (in this example - the 48% mark), you carry on using the phone and then the battery gets unstuck and drops more than 10% in a split second....?! This generally happens whenever my battery is less than 50% charged. I also find that when my phone is over 50%, the charge stays well above 50 for a good 2 to 3 days (under normal usage) however, as soon as it drops to less than 50%, I can start the day at 50% but by the end of the day, the phone will be have dropped to anything between 20% and 30%?? I have tried to re-calibrate the battery (if there is even such a thing?!!) by charging it and letting it drop to 20% before re-charging but it doesn't seem to help.....?!