Not needed anymore!
Please use the latest firmware to fix the battery issue. See: https://gitlab.freedesktop.org/upower/upower/-/issues/62
Scripts to automatically set charge_start_threshold to reasonable values, so the batteries are charged and switched correctly.
There is a bug either in the Linux kernel or the lenovo power management, that when not charging, only one battery is used and never the extra battery.
When the first battery is empty the laptop can simply crash, since the Linux kernel thinks there is still more power, but some battery controller simply kills the power to protect the battery.
By enabling charge_start_threshold, by using a number greater than 0, the battery is correctly switched when that threshold is reached. But when the battery capacity is higher, then the battery won't charge.
This project tries to mitigate this dilema, by automatically setting the charge_start_threshold values accordingly to the current AC power status.
To install run sudo ./install.sh.
To uninstall run sudo ./uninstall.sh.
In both cases your system could need a restart, so udev can reload the event monitoring rules correctly.
- Lenovo T470s