2 battery saving options some might not know about.

[smooth2222]

Settings/spen/turn off pen detection. ( if you dont use the pen)

Apps/google settings/search & now/voice/ ok google detection/. Off off off. (If you dont use it)

This has nothing to do with double tapping home button.

 

[Golfdriver97]

Interesting on the SPen. Thanks for sharing.