systemd-battery-check.service, systemd-battery-check - Check battery level whether there's enough charge,

       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.

       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:

       systemd.battery_check=BOOL
           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.

           Added in version 254.

       systemd-battery-check.service, systemd-battery-check - Check battery level whether there's enough charge,
       and power off if not

       The following options are understood by systemd-battery-check:

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

systemd(1)

systemd 257.7                                                                   SYSTEMD-BATTERY-CHECK.SERVICE(8)

       systemd-battery-check.service

       /usr/lib/systemd/systemd-battery-check [OPTIONS...]