Limit battery charge to 80% or 90%

[alba4k]

[Manjaro Linux Phavo, KDE Plasma desktop environnement, 5.15.2-2 Linux Kernel]

As the title states, I'd like to limit my battery charging to sligthly below 100%

I know there is an option for it in the BIOS, but it doesnt seem to work anymore. It limited the charging to 80%, but now randomly stopped working and goes up to 100% again

Any way to get a similar feature?

neofetch shows "Battery0: 100% [Full]"

Haven't found any usefult files for it in /sys/class/power_supply/BAT0, but it might even be me

return of "ls -a":

.   alarm     capacity_level  charge_full_design  current_now  device  manufacturer  power    serial_number  subsystem   type    voltage_min_design
..  capacity  charge_full     charge_now          cycle_count  hwmon3  model_name    present  status         technology  uevent  voltage_now