Both my iPhone 4 and iPad are experiencing sudden loss in battery life. I used to leave my iPad unplugged for weeks and it would not loose charge; now it is draining after a day sitting idle. Given that the change was so dramatic I did not feel it was a result of old batteries rather a rogue process. I haven't installed any new apps, but I am very diligent about updates. I've been running iOS 6.01 since it was released I installed the app "System Status" and confirmed my theory - the CPU on my iPhone 4 and iPad is pretty much stuck at 100% - compared to my wife's 4S that is ~5-10%. I definitely have more apps than my wife, but we both have the same most used apps - Flipboard, Facebook, Imo as well as iTunes match. I tried resetting both of my devices and running with minimal apps. This seemed to work for my iPad, but not my iPhone. What is the best way to determine the apps that are eating up CPU?