S5 battery is awesome. I'm a moderate user, and have yet to kill this thing. The nice thing about the s5 though is that it has an ultra power saving mode, so if you're in a bind you can turn that on and make your battery last for days.
I've used the S4 and S5 very heavily and the battery on the S5 is terrific. On the S4 I would get about 6 hours and now using the S5 with the same load I am getting about 10 hours. I use the normal power saving mode on both. The S5 battery is working for me.
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