I have heard a lot of remarks about degrading batteries in the Iphone. I never had that problem until recently. I recharged my battery the other night and it was 97 percent when I turned it off for the night. I woke up and it was 62%. I know it was off because I slid the bar to the right. I used it a bit for the day and looked down and poof ! I was at 21%. I did nothing to justify a reduction in 40% battery levels. I was wondering if the APPS might be running in the background and using the battery even if I am not using the phone. I checked my battery indicator and it says it is good to 97%.......in other words.......even though my phone is 18 months old, the battery is still retaining 97% of its original capacity. I know Apple is replacing their batteries but I have not done that yet. Any suggestions or ideas?