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Bin unnecessary widgets and wallpapers
There's no such thing as something for nothing, so get rid of anything you're not using or don't find useful.
Clock on Apps and swipe left to go to Widgets to see what's installed.
Live wallpapers are a far bigger drain on your device's battery than static wallpapers, so if you want the most out of your battery, don't use them.
Tap Settings > Display > Wallpaper to check or change your settings.
Sleep the screen
Since we've already ascertained that the screen is one of the biggest drains on a device, it makes sense to not have it on when you're not using the device. Set it to go to sleep after a short interval.
To do this tap Settings > Display > Sleep to change the interval. I keep it around 15 to 30 seconds.
Ultra power saving mode
Some devices such as the Samsung Galaxy S5 feature an ultra power saving mode that reduces functionality offered so you get more life out of whatever battery you have left.
Useful if you're in a power jam, but they reduce functionality dramatically.