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ACPIBAT(4) Device Drivers Manual ACPIBAT(4)

acpibatACPI control method battery

acpibat* at acpi?

The 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 sysctl(8) or sensorsd(8).

acpi(4), acpisbs(4), intro(4), sensorsd(8), sysctl(8)

The acpibat driver first appeared in OpenBSD 3.8.

The acpibat driver was written by Marco Peereboom <>.

Some systems do not propagate battery insertion up to the driver.

March 30, 2017 OpenBSD-current