From owner-freebsd-mobile@FreeBSD.ORG  Wed Oct 19 03:53:22 2011
Return-Path: <owner-freebsd-mobile@FreeBSD.ORG>
Delivered-To: freebsd-mobile@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 46C1B106566B
	for <freebsd-mobile@freebsd.org>; Wed, 19 Oct 2011 03:53:22 +0000 (UTC)
	(envelope-from smithi@nimnet.asn.au)
Received: from sola.nimnet.asn.au (paqi.nimnet.asn.au [115.70.110.159])
	by mx1.freebsd.org (Postfix) with ESMTP id C19A98FC0C
	for <freebsd-mobile@freebsd.org>; Wed, 19 Oct 2011 03:53:21 +0000 (UTC)
Received: from localhost (localhost [127.0.0.1])
	by sola.nimnet.asn.au (8.14.2/8.14.2) with ESMTP id p9J3IEnJ043324;
	Wed, 19 Oct 2011 14:18:14 +1100 (EST)
	(envelope-from smithi@nimnet.asn.au)
Date: Wed, 19 Oct 2011 14:18:14 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Dmitry Kolosov <onyx@z-up.ru>
In-Reply-To: <201110182335.15862.onyx@z-up.ru>
Message-ID: <20111019135942.C21255@sola.nimnet.asn.au>
References: <201110182335.15862.onyx@z-up.ru>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Cc: freebsd-mobile@freebsd.org
Subject: Re: Battery charge limiting
X-BeenThere: freebsd-mobile@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Mobile computing with FreeBSD <freebsd-mobile.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-mobile>, 
	<mailto:freebsd-mobile-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-mobile>
List-Post: <mailto:freebsd-mobile@freebsd.org>
List-Help: <mailto:freebsd-mobile-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-mobile>,
	<mailto:freebsd-mobile-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 19 Oct 2011 03:53:22 -0000

On Tue, 18 Oct 2011, Dmitry Kolosov wrote:
 > Is there a way to limit maximum battery charge level in FreeBSD?
 > As for common notebook battery usage recommendations - the best way to prolong 
 > your battery life is to install and use software (available on windows), that 
 > limits maximum charge level on about 80%, not giving battery to charge full. 
 > so, it possible software-way, depending on (?) battery's controller. 

I've never heard of such a theory as limiting charge to prolong battery 
life, not with Lithium Ion batteries anyway; nor have I ever seen any 
such as a BIOS option.  'Common' on which brand/s of notebooks?

Can you provide any links to articles discussing this?

I don't think control over a notebook's charging is possible in FreeBSD; 
this is usually managed by an Embedded Controller and ACPI merely passes 
on the the states reported by that and by the battery itself.

cheers, Ian