So I've been having horrible battery life. It's been five hours and im at 40% with not much use at all today. I used gps for like 10 minutes and other tha nthat it's been sitting in my pocket at school. So i look at battery usage, that 10 minutes of gps tracking is 34%, followed by 16% phone idle followed by 13% display and 8% gphone manager free. TIPS PLEASE, how can 10-20 minute of gps use and mostly standby all day be down to 40% after 5 hours??