How to refresh the battery fuel meter?

not related to L5 … but will any of the future PureOS updates translate to me being able to have an accurate charge/discharge rate of my UPS ? … in the GUI-front-end i mean (GNOME/‘Power-Statistics’ app)

currently not very interesting for APC UPSs …

This is going to depend on what Debian/GNOME does. I’m not aware of any effort within Purism to support UPS.