If you don't want a list of software engineering feats as long as your arm simply to squeeze an additional half hour out of your battery, then we're here to tell you the single biggest secret to extending your battery life. A single setting is all it takes. The one trick you need to know to save battery life on Android is...
Limit your screen output
The screen is the biggest power sucker on your Android device, so the more you can do to limit its demands on your battery, the better. Simply making your screen timeout setting as short as humanly possible can have a significant effect on your battery, as can dropping the display brightness.
What is screen timeout, I hear you ask? Screen timeout is the amount of time your screen stays active once you've stopped using it. By default it is often set to a longer time than is necessary and most people don't ever think to change it.
Personally, I can live with 15 seconds, for others it's 30 seconds. But it doesn’t take a math genius to realize both of these are orders of magnitude better than two minutes. Go to Settings > Display > Sleep
While you're at it, drop your screen brightness to as low as you can possibly handle, and make sure auto-brightness is turned off, as all that adjusting of the brightness consumes a lot of battery. You can always manually bump up your brightness when you need it (and then straight back down afterward). Go to Settings > Display > Brightness
Ok, so it was really two secrets, but these two simple display settings will make a significant difference to your Android battery life. Now you just have to look at it less.
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What is your screen timeout set to? Do you use auto-brightness?