I use KDE connect to move files between PC and smartphone and it runs very well. Maybe I will need additional functions in the future, but now it is fine for me.

Only one item: it use too much energy on the smartphone, even if there is no connection or I disable it. And this empties the battery rather soon.
For this reason Android sometimes generates the message "KDE Connect uses much energy". In this case I force KDE Connect to exit through the button "force shut down" in App-Info. But it continues running.
Connection between PC and Smartphone takes place through WLAN connection with router.
My suspicion: KDE Connect every time looks for possible connectable devices.

There is maybe a command (or a script) to stop definitively KDE Connect, when it is not in use?

Thanks in advice for suggestions


PC-Data:
OS: OpenSuse Leap 15.1
KDE Plasma: 5.12.8
KDE Frameworks: 5.55.0
Qt version: 5.9.7
KDE Connect: 1.3.3

Smartphone-Data
Android: 8.1
F-Droid: 1.9
Kde Connect 1.14.2

This is not your solution...
but on my Samsung Galaxy, I have the option to clear--all or selective--app items in RAM
that worked for this issue until on the Kubuntu side, it wasn't connecting/finding the Android folders
there were various loops that I had to navigate to get that working again
but in the end, I disabled kconnect and now I use gvfs-backends instead
that solved both my phone problems

How about a newer Android version? 8.x is rather old nowadays and battery saving on old Android versions was notoriously bad. I have no problem on Android 10...

@Mamarok wrote:
"How about a newer Android version? 8.x is rather old nowadays and battery saving on old Android versions was notoriously bad. I have no problem on Android 10...".

AW: I don't think, I'll get an update, because updating an android smartphone can become an adventure with no return, if you have a cheap phone and not experience with that.
BTW: my smartphone does not usually consume much energy, but with KDE Connect.

And I maybe found a temporarily solution for saving energy: When I don't need to connect the phone either to WLAN or with my PC, I must disable the WLAN function.

In the next days, If I have time enough, I'll try gvfs-backends, as @abury suggested.

Thanks a lot for ideas and opinion exchanging!

You should probably use it over Wifi instead of Bluetooth. Wifi is very power hungry and most of the time, it's not required. If I were you, I'd use just switch to bluetooth and be done with the huge power consumption. Look here for a tutorial, it's not that hard.