---
name: "acpibat"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/acpibat"
---

# acpibat(4)

ACPI control method battery

## NAME

**acpibat** – ACPI control method battery

## SYNOPSIS

**acpibat\* at acpi?**

## DESCRIPTION

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)](/sysctl/8.md) or [sensorsd(8)](/sensorsd/8.md).

## SEE ALSO

[acpi(4)](/acpi/4.md), [acpisbs(4)](/acpisbs/4.md), [intro(4)](/intro/4.md), [sensorsd(8)](/sensorsd/8.md), [sysctl(8)](/sysctl/8.md)

## HISTORY

The **acpibat** driver first appeared in OpenBSD 3.8.

## AUTHORS

The **acpibat** driver was written by Marco Peereboom ⟨*marco@openbsd.org*⟩.

## BUGS

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