I see the thread has come alive again.
Since last June when this thread was very active, I gave my wife an S5 phone for Christmas.
Her "Average Use" is "Receive Calls Only, leave it alone until then".
Her S5 is using about 3 or 4 percent battery per day. I just looked at it yesterday evening and it was at 81% and the last charge was on Saturday the 3rd... so 4 days in that cycle...
I have her phone pretty much shut down, all apps she does not need to receive a call have been turned off or uninstalled.
I installed MacroDroid on it to turn the Internet ON when she uses the phone, and like my S5, MacroDroid turns off the Internet when the phone is idle and sleeping.
I get 3 to 4 days use per charge if I am home and using the desktop because MacroDroid shuts my phone down also. It is a penchant of mine to shut out the "Outside World" unless I wish to invite it in.
Here are a couple of screen shots taken at various times... not today.