I got my new Lenovo T480 laptop which has two batteries: one internal and one external. The used Linux is Arch Linux.
If I use the battery the behavior is that the first battery is used down to 5% capacity and at this moment the second battery powers the laptop.
I want to change the value from 5% to 20% because using the battery down to 5% is in my opinion not the best way to get a healthy and long living battery.
With tlp I found a way to optimize the charging threshold. But at the moment I find existing no way to tell linux (or the notebook in general) to switch to the second battery if the first is under 20% capacity.
Is there any existing solution/best practice in the community? Otherwise I must build an own service which checks the battery every 5 minutes and switch manually via tlp and
force_discharge (if it is possible).