So my average battery life was three days, after which I would show a usage of about 5 hours (which seems about right). Since a couple weeks, my usage is often almost as high as the standby. E.g., after a full charge in the morning, it would show maybe 10 hours standby in the evening, and almost 10 hours of usage (which is not true). Since this is happening, I need to recharge every two days. Right now, I am showing 1 day and 11 hrs standby with 15 hrs of usage (not right) and a 31% remaining charge. I checked all apps that might be running in the background, but there are none that could count. I rebooted, and no change. I did notice a few of the settings had also changed since this unrealistic high usage, so something must have changed within my OS. But what could it be?