I went through pages and pages trying to establish a "cure" for battery drain. Eventually I decided to let go...set locations on, push on, icloud on (except safari), 3G on, everything on and set as it should be....and now my battery drain is 13% per hour, where it was with all the "cures" between 12% and 16%. It just shows one thing: we are so busy trying to establish something, that we forget to use the phone and enjoy it! My advise to people is, don't fiddle around with your phone. Use it and plan to not run out of power. In the end one is so busy checking battery usage that you are doing more harm than good.