Dim Your Screen

This one tip affects battery life drastically. It’s obvious that dimming your screen will reduce your smartphone’s power consumption since we all have to activate the screen whenever we use our phones. If our screen is brightly lit up every couple of minutes when we check our emails and such, it eventually will zap battery juice. Auto-brightness setting enable the smartphone to adjust the brightness to its optimal level for reading while conserving battery life.
On the other hand though, you may consider tuning the level permanently to the dimmest level that you can still read under without straining your eyes. Doing so may do wonders to your battery life in the long run.