Date: Wed, 19 Oct 2011 12:05:05 -0700 From: Kevin Oberman <kob6558@gmail.com> To: Jim Pazarena <fmobile@paz.bz> Cc: freebsd-mobile@freebsd.org Subject: Re: Battery charge limiting Message-ID: <CAN6yY1v6nWRZAF-YnzwwQE4PB1idxU734mxVT4p0613c8tWxFQ@mail.gmail.com> 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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On Wed, Oct 19, 2011 at 10:34 AM, Jim Pazarena <fmobile@paz.bz> wrote: > 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> =A0wrote: >>> >>> 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 captured their podcast, and created a wav file (48Mb download) which > is available at ftp://ftp.haidagwaii.net/wav/ > specifically at: > ftp://ftp.haidagwaii.net/wav/lithium_ion_batteries_care-and-maintenance48= Mb.wav I have found Leo Laporte to be a very knowledgeable guy and I completely agree with most of what he is saying, but Lenovo is not suggesting the discharge of the battery, similar to how NiCads need to be treated. The issue is keeping batteries charged to 100% at all times. It's worth noting that the batteries in satellites, where long life is REALLY critical are only charged to 80% to keep them alive longer. See http://batteryuniversity.com/learn/article/how_to_prolong_lithi= um_based_batteries for a good explanation of the issue. It is discussed near the end o the article after the very telling Figure 4. I found severl other articles that contain similar information, but don't really provide much detail. --=20 R. Kevin Oberman, Network Engineer E-mail: kob6558@gmail.com
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