How to save battery life on IPhone?

I have iPhone 5s And I want it to last for a whole day and I have everything turned off but sometimes it last only for 4 hours or 5 hours how do I save the battery on my phone for 10 hours?

Drop screen brightness way down to where you can just see it good enough, set Wi-Fi to turn off during sleep, keep phone in sleep mode when not in use.

Don't use it

1. Turn the brightness all the way down so you can still see what your doing, but make sure it's not too bright. That will help.
2. After you are done using an app or on safari or anything else, double tap the middle button and swipe up to turn of the apps. That saves battery because not a lot of apps are running when they don't need to be.
3. Stay off it a little bit. When you aren't using it just turn it off. Save the battery for more important reasons than gaming and other not important things.