systemd-battery-check.service, systemd-battery-check — Check battery level whether there's enough charge, and power off if not
This service checks the presence of an external power supply and the battery level during the early boot stage to determine whether there is sufficient power to carry on with the booting process.
systemd-battery-check returns success if the device is connected to an AC power source or if the battery charge is greater than 5%. It returns failure otherwise.
The following options are understood by systemd-battery-check:
On success (running on AC power or battery capacity greater than 5%), 0 is returned, a non-zero failure code otherwise.
The following variables are understood:
Takes a boolean. If specified with false, systemd-battery-check command
will return immediately with exit status 0 without checking battery capacity and AC power
existence, and the service
systemd-battery-check.service will succeed. This
may be useful when the command wrongly detects and reports battery capacity percentage or AC power
existence, or when you want to boot the system forcibly.