Re: Laptop battery

On Fri, 17 Feb 2006, Micha Feigin wrote:
If the battery is Li-Ion then their nice due to relatively high capacity and
presumably no memory but they have a lifespan of about two to two and a half
years without regard to usage (storing them half charged when not used is best
though).

T20s have Li-ion inteligent batteries.

Hmm, if you use them exactly the wrong way (keep them inside the laptop
where it is warm/hot, and fully charged to capacity almost all the time, and
always do full-drains for some stupid reason), they won't last even one year
without degrading to half capacity, pehaps worse.

Storing Li-ion at ~15C (well don't go below 10C, if it freezes, you may need
a new one...) with 40% charge should let them have a better shelf-life.
They will still degrade, and you must take a look on the charge from time to
time, because if it gets too low...

I must find out what to do with Li-polymer batteries, though :( The one I
have didn't handle the storage at 15C very nicely (depleted all of its
charge).

One of the problems (although this can also be viewed as a good point)
with IBM is that they run constantly through the battery and not directly
of the input power. At least newer ones don't work without the battery
even if you have power. This is done for surge protection and to function
as a UPS AFAIK but

This does not hold true for my IBM/Lenovo ThinkPad T43 (model 2687), and
that's a reasonably new machine (launched 2005-02). What machines exibit
the behaviour you describe?

I am not sure which system the t20 uses but if its acpi (check if you
have /proc/acpi/battery/BAT1/info) then its not debian thats reporting the
battery state. I'm not sure how apm works.

T20 has ACPI (according to thinkwiki.org), but it probably has APM as well.

I just replaced the battery on my laptop that after three years started
lasting 25 minutes on a charge. Now the new one reads

design capacity: 65140 mWh
last full capacity: 76560 mWh

Strange hah?

Is it brand new, or was it reconditioned? 10Wh is a lot of capacity to
deviate from the design predictions...

--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh


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