My laptop model is Asus x510uf. Based on what I've found on following links, if there's a variable under /sys/class/power_supply/BAT*/ called "charge_control_end_threshold", laptop supports charge limits. It looks I have such variable on my system. So it should support battery charge limit. But though this option was added on KDE Plasma 5.20, I don't see any related setting.
Linux/KDE Plasma: Kubuntu 21.04
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Computer Model: Asus Vivobook x510uf
We currently look for charge_stop_threshold
Next step is to find out who is in the wrong
I think we use an older Lenovo - proprietary interface whereas there is a newer standard one, cf also https://invent.kde.org/plasma/powerdevil/-/merge_requests/22
Thanks. It's fixed since many versions ago. Let me close it!