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+.\" $NetBSD: acpibat.4,v 1.9 2010/03/25 15:34:30 jruoho Exp $
+.\"
+.\" Copyright (c) 2002, 2004, 2010 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd March 17, 2010
+.Dt ACPIBAT 4
+.Os
+.Sh NAME
+.Nm acpibat
+.Nd ACPI Battery
+.Sh SYNOPSIS
+.Cd "acpibat* at acpi?"
+.Sh DESCRIPTION
+The
+.Nm
+driver supports
+.Tn ACPI
+batteries.
+.Pp
+The battery status is made available through the
+.Xr envsys 4
+.Tn API .
+The battery information can be displayed also with the
+.Xr envstat 8
+command:
+.Bd -literal -offset 2n
+$ 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
+.Ed
+.Pp
+Depending on the battery, the unit of measurement is either watt-hour
+.Tn Pq Wh
+or ampere-hour
+.Tn Pq Ah
+for the capacity related information.
+From these the
+.Dq charge
+is usually the most interesting value,
+but it is possible to derive useful information also from the other values.
+For example, when
+.Xr acpiacad 4
+is disconnected, the
+.Dq 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
+.Dq health
+of deteriorating lithium-ion batteries.
+.Sh EVENTS
+The
+.Nm
+driver is able to send events to
+.Xr powerd 8
+daemon when a capacity state has been changed.
+The new state will be reported as the
+.Em fourth
+argument to the
+.Pa /etc/powerd/scripts/sensor_battery
+script.
+If a custom capacity limit was set via
+.Xr envstat 8 ,
+the
+.Nm
+driver will report a
+.Em user-capacity
+event to the same script when current capacity limit has been reached.
+.Sh SEE ALSO
+.Xr acpi 4 ,
+.Xr envsys 4 ,
+.Xr envstat 8 ,
+.Xr powerd 8
+.Sh HISTORY
+The
+.Nm
+driver appeared in
+.Nx 1.6 .
+.Sh BUGS
+The
+.Tn ACPI
+specifications make a distinction between
+.Dq control method batteries
+and
+.Dq smart batteries .
+The
+.Nm
+driver only supports control method batteries.
+Furthermore,
+.Nm
+does not yet support some additional battery information introduced in the
+.Tn ACPI 4.0
+standard.