I was on holiday the other day and noticed something with my iPhone 5. I had it in the hotel room all day and literally didn't touch it. It was connected to wifi so will have been doing the regular stuff like checking emails every hour and stuff like that, but when I came back to it 9 hours after unplugging it at 100 percent, the battery had gone right down to 25 percent. I don't have a clue how it could have done this. Location services hadn't been used or no apps had been updated. Bluetooth was also turned off. It didn't seem to have done anything but gone right down to 25 percent.
Since then it has been going down really quick and don't know how. Any suggestions?