Date: Tue, 18 Oct 2011 22:44:52 -0700 From: Kevin Oberman <kob6558@gmail.com> To: Dmitry Kolosov <onyx@z-up.ru> Cc: freebsd-mobile@freebsd.org Subject: Re: Battery charge limiting Message-ID: <CAN6yY1s-z4Gwau6Yj3XWyA50114aOE9CNtFhJOpU=y0LtwtC2w@mail.gmail.com> In-Reply-To: <201110190844.17703.onyx@z-up.ru> References: <201110182335.15862.onyx@z-up.ru> <20111019135942.C21255@sola.nimnet.asn.au> <201110190844.17703.onyx@z-up.ru>
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On Tue, Oct 18, 2011 at 9:44 PM, Dmitry Kolosov <onyx@z-up.ru> wrote: >> 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. =A0'Common' on which brand/s of notebooks? >> >> Can you provide any links to articles discussing this? > > http://hintsforums.macworld.com/archive/index.php/t-104440.html > http://askubuntu.com/questions/34452/how-can-i-limit-charging-capacity-to= - > extend-a-batterys-lifespan > > Lenovo provides such programs with their new products. A program can hold= a > battery at 70-80%% while it not used. > >> 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. > > May be modern EC provides some controlling methods or so? Actually, my old IBM ThinkPad started providing this advice after I updated the power management. The issue is with batteries kept at 100% charge for long periods fail more quickly. The power management software stops the charging when it reac= hes 80% of capacity, if you choose to set it that way. This is under the control of the power management software though I assume = that the EC had to have the capabilityto stop the charging. --=20 R. Kevin Oberman, Network Engineer E-mail: kob6558@gmail.com
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