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

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

     acpibat -- ACPI Battery

     acpibat* at acpi?

     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.

     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.

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

     The acpibat driver appeared in NetBSD 1.6.

     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

BSD					  March 17, 2010				      BSD

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