It started Wednesday night. I have an iPhone 4 and some apps came through with updates so I did that. Ever since then my battery will only last about 4 hours without zero use. Yesterday I upgraded to iOS 7 hoping this would solve the problem but it hasn't. Yesterday I took my phone fully charged off the charger at 11 pm and went to bed. This morning at 7 when I woke up the battery was at 24%. Any suggestions?