My usage has always been under 2 hours and 30 minutes, but now I just got the 20% warning with 1 hour and 18 minutes of usage, with location services off. It's odd, since when I went to sleep I had 90% battery life, but when I woke up this morning it had around 40%. My email check is set to hourly. Is anyone else getting this poor of a battery life, or should I return my iPhone?