Most of the time, I have enough power for my Samsung Galaxy SIII to operate for the whole day; at the end of the day my battery charge is about 35%. However, today, the battery died prematurely. I noticed the battery usage screen, and it says that 28% of the battery is used by the Android OS. How could this have happened?
EDIT: My question has been marked as a duplicate, but the target does not have any solution, so those answers do not fully address my question. Though I agree in the fact that this question is the same as the target.