ACPI control method battery
acpibat driver supports the ACPI Control Method
Battery interface between the battery and the host. Information about the
battery, such as capacity, recharge rate, voltage, and serial number, is
available through this driver. Battery status is updated through an event
triggered when a battery changes state (such as starting to charge) and, as a
failsafe if the system does not support passing such events, every 10 seconds.
Battery status can be monitored using
acpibat driver first appeared in
Some systems do not propagate battery insertion up to the driver.