Originally Posted by
iwicked Exactly what OBF said. I don't like the hassle of turning on/off the phone so airplane mode is convenient for me. I checked the battery usage but there is nothing out of the ordinary. Battery is draining really fast and its taking ages to charge. I put it on airplane mode at 40% and by morning its dead. I think my battery is fried.

If that's your only phone, then in airplane mode you would get no emergency call alerts from family or close friends. In your case, airplane mode is not your answer. If you think your battery is not performing properly, do this test. It will tell you if the battery is bad. If it passes the test, then the issue is somewhere else.
So here's the test: write down your usage and standby time, press the sleep/wake button (or lock button, as some call it) to put the device to sleep, and set the device down for five minutes. When you come back, take note of the change in time. If your device is sleeping properly, then the Standby time should have increased by five minutes and your Usage time by <1 minute . If your Usage time rises by more than one minute, you have a drain problem. Something is keeping your device from sleeping properly, significantly shortening the time it will last.
Sent from my ancient but trustworthy iPhone 5.