[TriLUG] Thinkpad Battery Charging Thresholds

[Robert Dale]

BTW, I ran only Linux on the HP, Lenovo, and Dell laptops.  There was
no magic Windows software regulating the battery charge.

On Tue, Feb 15, 2011 at 8:25 PM, Robert Dale <robdale at gmail.com> wrote:
> I guess I have a different interpretation.
>
> Going by the chart - throwing-out 40C and 60C since I don't work in
> the desert for prolonged periods of time; I typically work in balmy
> indoor 25C weather - I can still run my laptop twice as long on 80%
> batteries over 40% of 96% capacity which is 38.4%. Even if you charge
> up to 80%, you still only have 76.8% available. And if you stop
> working at 30% then you can still only get 46.8% usable battery. Which
> may be very well and good if you're using your laptop battery as a UPS
> instead of a means to be mobile.
>
> I don't see in the article where it mentions a specific range of 30%-
> 80%.  The articles does stress that temperature and charge _rates_ are
> more of a factor than charge cycles and levels.
>
> I'm slightly confused by the mention to not freeze your battery when
> the lab results were best at 0C.
>
> I don't know theirs or your particular battery/laptop setup, but the
> laptops that I've had in the past year or two don't keep the battery
> temperature elevated when not actually charging the battery.  The
> power supply or something seems to be smart enough to stop charging at
> a certain point.
>
> Everyone's situation is different,  but in my real life experience,
> battery lifetime appears to be long enough that the effort required to
> baby-sit the battery isn't worth it. Even if you took 2 minutes every
> work day, that's 8 hours of baby sitting time.  A baby-sitter
> typically makes $12/hr.  So, at the end of the day, I've done no extra
> work, wasted no time and get 80% of my battery, while you've wasted
> $96 on baby-sitting and realized only 47% of your battery's potential.
>
> :-)
>
> On Tue, Feb 15, 2011 at 7:37 PM, Joseph Mack NA3T <jmack at wm7d.net> wrote:
>> On Tue, 15 Feb 2011, John Brier wrote:
>>
>>>> I know that optimally the battery
>>>> should be between 30 % and 80 % of full charge
>>>
>>> Where did you hear this?
>>
>> how about google
>>
>> http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
>>
>> o keep batteries cool (pull them out when the laptop is plugged into the
>> mains)
>>
>> o don't full charge
>>
>> o charge slowly
>>
>> Prius batteries are normally charged to about half full.
>>
>> Satellite batteries are nursed carefully. They aren't allowed to be fully
>> charged.
>>
>> Joe
>>
>> --
>> Joseph Mack NA3T EME(B,D), FM05lw North Carolina
>> jmack (at) wm7d (dot) net - azimuthal equidistant map
>> generator at http://www.wm7d.net/azproj.shtml
>> Homepage http://www.austintek.com/ It's GNU/Linux!
>> --
>> This message was sent to: Robert Dale <robdale at gmail.com>
>> To unsubscribe, send a blank message to trilug-leave at trilug.org from that
>> address.
>> TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug
>> Unsubscribe or edit options on the web  :
>> http://www.trilug.org/mailman/options/trilug/robdale%40gmail.com
>> TriLUG FAQ          : http://www.trilug.org/wiki/Frequently_Asked_Questions
>>
>
>
>
> --
> Robert Dale
>



-- 
Robert Dale