I had already blogged on how to limit battery charge on LG Gram in Linux. In that post, you had to manually set the threshold “80” in the file “/sys/devices/platform/lg-laptop/battery_care_limit”.

With TLP, the procedure is easier and more automatic.

First, you must install tlp (remember that tlp conflicts with power-profiles-daemon, so you have to disable the latter first or uninstall it). In Arch-based distros:

Ensure that the tlp service is enabled on boot and the first time you should start it (“sudo systemctl start tlp”).

By running “sudo tlp-stat”, you should see near the end this line:

Edit the file “/etc/tlp.conf” and uncomment the following lines (note there’s one also for the start of charging, but that option doesn’t seem to be supported in this laptop):

Restart the service (“sudo systemctl restart tlp.service”), and it should be already active (run “tlp-stat” again):

That’s all. This will persist on reboot. However, this will not persist if you hibernate and return from hibernation (unless you restart the tlp service as shown above).