Settings Power Optimization

[ROE_HUNTER]

This was initially ticked off. Does it actually help? Any side effects?

 

[Rukbat]

It stops apps from running when you're not using them. Whether it saves battery depends on your usage. And you may not want some apps optimized (like your email app if you want to get notified of new emails as they arrive).

 

[KruseLudsMobile]

This was initially ticked off. Does it actually help? Any side effects?

The only thing is you don't want it to stop some apps - the clock widget on my phone talks to a related app on the phone, and that app was being stopped - so the clock was wrong until I changed that ("Beautiful Widgets").