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Must be set to 0x0 to indicate units are milliwatts and milliwatt-hours. Topicsĭetermines if the units reported by the hardware are milliamps and milliamp-hours or milliwatts and milliwatt-hours. The following table expands on the definitions of the fields that are described in section 10.2.2.2 of the ACPI specification, and enumerates Windows-specific requirements for this information. The ACPI firmware must implement the _BIX method for each battery to provide static information about the battery, including design capacity, cycle count, and serial number. ACPI implementation of battery static information The following discussion presents the details of these methods and describes their Windows-specific requirements. Optionally, a battery device can implement the Slot Unit Number (_SUN) or indicate battery order for the purposes of display in the user interface (UI). Support level-of-charge events by using the Battery Trip Point (_BTP) mechanism.Report battery status by using the Battery Status (_BST) control method.Report static information by using the Battery Information Extended (_BIX) method.Implement the Status (_STA) method to indicate if the device is enabled, disabled, or not present.Identify itself with a Hardware ID (_HID) of "PNP0C0A".Each battery device must do all of the following: The ACPI firmware must provide and implement an ACPI control method object for each battery in the system per section 10.2 of the ACPI specification. This must be performed immediately after the platform detects the physical state change. When the state of _PSR changes, the platform must generate an interrupt and a Notify(0x80) command on the device in the ACPI namespace. The _PSR method must only report online (AC power) when the system is connected to main power. This method returns the status of the power source and conveys whether the power source is currently online (AC power) or offline (on battery power). This object must also implement the Power Source (_PSR) method. (Additional power source objects may be present on server systems that have multiple power supplies.)

Client systems must not provide multiple power source device objects.

This object must represent the composite status of power inputs for the system. Note For systems that have multiple power sources, all physical power sources must be multiplexed through a single power device object in ACPI. This object must report itself with a Hardware ID (_HID) of "ACPI0003". The ACPI firmware must provide and implement a single ACPI power source device per section 10.3 of the ACPI specification. Some of the information described in this article is specific to Windows and is not detailed in the recent ACPI specification.