Use APKPure App
Get Hibernate old version APK for Android
Low Battery Mode app, also useful for setting an alarm to get you up in morning
Low Battery Mode app.
Useful to set alarm and not run down battery overnight (calls preferred alarm app).
Warns you to turn off GPS.
In trials overnight battery use was less than 1%.
Also 1 click widget.
*Google Android doesn't allow set Airplane Mode so this app cannot have any support*.