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NetBSD 6.1.5 - man page for acpibat (netbsd section 4)

ACPIBAT(4)			   BSD Kernel Interfaces Manual 		       ACPIBAT(4)

NAME
     acpibat -- ACPI Battery

SYNOPSIS
     acpibat* at acpi?

DESCRIPTION
     The acpibat driver supports ACPI batteries.

     The battery status is made available through the envsys(4) API.  The battery information can
     be displayed also with the envstat(8) command:

       $ envstat -d acpibat0
		       Current	CritMax  WarnMax  WarnMin  CritMin Unit
	      present:	    ON
       design voltage:	14.400					      V
	      voltage:	16.267					      V
	   design cap:	74.880					     Wh
	last full cap:	48.260					     Wh
	       charge:	47.910			    5.000%   0.414%  Wh (99.27%)
	  charge rate:	   N/A
       discharge rate:	16.641					      W
	     charging:	   OFF
	 charge state:	NORMAL

     Depending on the battery, the unit of measurement is either watt-hour (Wh) or ampere-hour
     (Ah) for the capacity related information.  From these the ``charge'' is usually the most
     interesting value, but it is possible to derive useful information also from the other val-
     ues.  For example, when acpiacad(4) is disconnected, the ``discharge rate'' gives a coarse
     approximation of the current power consumption.  The ratio between the design capacity and
     the last full capacity on the other hand reveals the overall ``health'' of deteriorating
     lithium-ion batteries.

EVENTS
     The acpibat driver is able to send events to powerd(8) daemon when a capacity state has been
     changed.  The new state will be reported as the fourth argument to the
     /etc/powerd/scripts/sensor_battery script.  If a custom capacity limit was set via
     envstat(8), the acpibat driver will report a user-capacity event to the same script when
     current capacity limit has been reached.

SEE ALSO
     acpi(4), envsys(4), envstat(8), powerd(8)

HISTORY
     The acpibat driver appeared in NetBSD 1.6.

BUGS
     The ACPI specifications make a distinction between ``control method batteries'' and ``smart
     batteries''.  The acpibat driver only supports control method batteries.  Furthermore,
     acpibat does not yet support some additional battery information introduced in the ACPI 4.0
     standard.

BSD					  March 17, 2010				      BSD


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