I have an iPhone 4S with iOS 7.0.
Since the upgrade, my battery drains twice as fast.
I have applied all the battery saving tips available on the internet (e.g. http://osxdaily.com/2013/09/19/ios-7-battery-life-fix/).
iPhone is primarily used for phone calls, texting, email, documents/scheduling/productivity, and light web surfing.
Anyone experiencing similar issues? Any suggestions or fixes to apply?