How to find out what apps are draining your Android phone's battery

If your Android battery is prematurely running out, this trick might help you extend the time between charges.

For some Android users, battery life can be a constant problem, especially when working with a non-flagship device (where batteries tend to be smaller and less capable of making it through the day) or with apps that aren't optimized for battery life. 

You've seen this plot play out in many films or TV series. A character is in a very tough situation and has to make a life-saving phone call... only to find out their phone battery has 1% remaining. 

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This might have even happened to you in real life -- and it can be a hair-pulling experience.

To that end, how do you find out what apps are guilty of draining your ...