My iPhone 5 battery drained super fast today. Yesterday I flew from Pittsburgh to Los Angeles everything was ok. Now I am here in LA and my battery is not lasting long. I went from 96% to 76% in a matter of 30 minutes i didn't even touch my phone. As it was rapidly dyeing today I went from 7% to 1% with in 2 minutes it is ridiculous. What is going on? I have very low signal 1-2 bars. But the phone is not just sitting there searching for service.