Date: Mon, 24 Oct 2011 16:17:27 +0000 From: "Andresen, Jason R." <jandrese@mitre.org> To: "freebsd-mobile@freebsd.org" <freebsd-mobile@freebsd.org> Subject: RE: Battery charge limiting Message-ID: <027252D1B68F5541829574B3220B4D7801081A@IMCMBX02.MITRE.ORG> In-Reply-To: <4E9F0A0E.10009@paz.bz> References: <201110182335.15862.onyx@z-up.ru> <201110190844.17703.onyx@z-up.ru> <CAN6yY1s-z4Gwau6Yj3XWyA50114aOE9CNtFhJOpU=y0LtwtC2w@mail.gmail.com> <201110191713.02435.onyx@z-up.ru> <CAN6yY1vu%2Bv0aU%2BstqwRo216TwAadLHdwdYQsjPS=R8gkBKR61A@mail.gmail.com> <4E9F0A0E.10009@paz.bz>
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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<onyx@z-up.ru> 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 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 about overcharging.
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