Battery saving mode all the time

Sailfish OS (5.0) UI allows to start the battery saving mode / power saving mode at will from the Battery setting menu, and to set a threshold from which the battery saving mode is automatically enabled. This threshold can be chosen between 20%, 15%, 10%, 5%… But not higher than 20%.

Even if this mode isn't saving much battery, if you want to have it set all the time you can use this commands from the Terminal :

devel-su pkcon install mce-tools # to install the package that contains the mcetool command line program

mcetool --set-psm-threshold=100 --set-power-saving-mode=enabled --set-forced-psm=enable

This second line enables the power saving mode and sets it to auto-start from 100%. This way you'll be using your phone in power saving mode all the time except when it is plugged (loading the battery).

This setting is kept even after a reboot, just like if you had a 100% label available in the graphical Battery settings to click on.