Re: iOS 7
I have the S4 myself and can go a full day on a full charge. I don't disable any of the radios either. I just have the screen set on auto brightness and power saving mode enabled.
FX-8350 @ 4.7 cooled by H80, 32GB Mushkin Enhanced Blackline 2133, Asus Sabertooth 990FX, 2x Radeon HD 7850 2GB in X-fire, 500GB Samsung 850 Evo, 4TB Seagate, 3TB WD Black, 2x 1TB WD RED in RAID 0