Re: Battery charge limiting

On Wed, Oct 19, 2011 at 10:34 AM, Jim Pazarena <[email protected]> wrote:
> Kevin Oberman wrote, On 2011-10-19 8:49 AM:
>>
>> On Wed, Oct 19, 2011 at 6:13 AM, Dmitry Kolosov<[email protected]>  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 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-maintenance48Mb.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_lithium_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.
-- 
R. Kevin Oberman, Network Engineer
E-mail: [email protected]
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