If you're getting battery issues, use the swipe up for quick settings and switch off your wifi and BT if you're not using them. Hunting for wifi all day really eats power. In settings switch off Background App Refresh, switch off auto brightness (seems to churn battery) and again use quick settings if you need to adjust - I find the mid point works nicely.
Plus the normal stuff, switch off button click noises, set the screen auto off to a short time, disable fetch new data for email (or switch the frequency down to hourly).
This may help too:- http://gizmodo.com/how-to-take-care-of-your-smartphone-battery-the-right-w-513217256/1416982678/@ericlimer