New iPhone 5s: sudden drop in battery life

[tmcafe]

I got a 5s about a month ago, AT&T. It's still with its original 7.1.1. Battery life has been great until the other day when I noticed in the evening with almost no use throughout the typical day it had dropped to below 10% and draining fast. Nothing different in reception or apps (I only keep Safari and Mail open).

The only thing that I can think of as different is that recently the iOS 8.1 update prompt popped in my settings. It was downloaded automatically but I haven't installed it yet and there's an option to delete the update.

Any thoughts appreciated.

 

[Zwhaler]

You wrote there's an option to delete the update? Try that. Otherwise, make sure all of your background app refreshing is off.

 

[tmcafe]

Thanks. I think the refresh option for the apps has been on since I got the phone but the battery lasted a long time. If the apps are not open does the refresh make any difference? I only have Safari and Mail open all the time and the refresh option is for only six apps (all of which I keep closed unless I use one for a minute).