From owner-freebsd-mobile@FreeBSD.ORG Mon Oct 24 16:32:44 2011 Return-Path: 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 4EBD71065676 for ; Mon, 24 Oct 2011 16:32:44 +0000 (UTC) (envelope-from jandrese@mitre.org) Received: from smtpksrv1.mitre.org (smtpksrv1.mitre.org [198.49.146.77]) by mx1.freebsd.org (Postfix) with ESMTP id 1FD3B8FC14 for ; Mon, 24 Oct 2011 16:32:43 +0000 (UTC) Received: from smtpksrv1.mitre.org (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 9267D21B106A for ; Mon, 24 Oct 2011 12:17:28 -0400 (EDT) Received: from IMCCAS02.MITRE.ORG (imccas02.mitre.org [129.83.29.79]) by smtpksrv1.mitre.org (Postfix) with ESMTP id 859B521B0436 for ; Mon, 24 Oct 2011 12:17:28 -0400 (EDT) Received: from IMCMBX02.MITRE.ORG ([169.254.2.229]) by IMCCAS02.MITRE.ORG ([129.83.29.79]) with mapi id 14.01.0339.001; Mon, 24 Oct 2011 12:17:28 -0400 From: "Andresen, Jason R." To: "freebsd-mobile@freebsd.org" Thread-Topic: Battery charge limiting Thread-Index: AQHMjc9mWblqZf+yRUymWg6eDJaJmJWDQugAgAAYC4CAABDtAIAAfTgAgAAru4CAAB02AIAHgl9g Date: Mon, 24 Oct 2011 16:17:27 +0000 Message-ID: <027252D1B68F5541829574B3220B4D7801081A@IMCMBX02.MITRE.ORG> References: <201110182335.15862.onyx@z-up.ru> <201110190844.17703.onyx@z-up.ru> <201110191713.02435.onyx@z-up.ru> <4E9F0A0E.10009@paz.bz> In-Reply-To: <4E9F0A0E.10009@paz.bz> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [129.83.31.51] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Oct 2011 16:32:44 -0000 From: owner-freebsd-mobile@freebsd.org [mailto:owner-freebsd- >mobile@freebsd.org] On Behalf Of Jim Pazarena >Kevin Oberman wrote, On 2011-10-19 8:49 AM: >> On Wed, Oct 19, 2011 at 6:13 AM, Dmitry Kolosov wrote: >>> Now the question is: how to discover EC/battery controller capabilities= of >>> such functions as holding battery about X% of full charge. >> >> Or to find the EC magic to turn off charging and create a daemon that >> monitors charge level nd turns charging off at about 80% and back on >> if it drops below 75%. > >renowned Tech Guy "Leo Laporte" and security expert "Steve Gibson" >had a discussion regarding lithium ion batteries, and Steve's findings >contradict these comments. I think the deal isn't that 100% charge is bad, but overcharging is what kills the battery. The problem is that the battery level is difficult= =20 to measure so most laptops end up overcharging the battery quite badly when trying to bring it up to 100%. If you stop at 80% (which seems overly conservative to me) then you never have to worry=20 about overcharging.=20