Re: Shutdown my Laptop? Why should I?

On Mon, 17 Jul 2006 12:57:01 -0500
Owen Heisler <owenh000@xxxxxxxxx> wrote:

On Sun, 2006-07-16 at 02:06 +0300, Micha Feigin wrote:
On Thu, 13 Jul 2006 22:51:03 -0500 Jay C Vollmer wrote:
On Thursday 13 July 2006 21:24, Carl Fink wrote:
I'm not an electrochemist, but modern Li-ion batteries don't develop
memory, they just lose capacity each time they're charged.

Isn't what you're describing 'memory?'

The end effect may be similar in terms of degraded performance, but the
chemical point of view is different.

I don't remember the specifics, but IIRC NiCad develop a 'memory' in that
the material 'remembers' it's charged state and won't discharge. It is
recommended to completely discharge these batteries on occasion to avoid
this.

Li-ion don't have this effect, but on the other hand they don't like to be
completely discharged. The problem is that they have several cells, and some
discharge faster then others. When some of the cells completely discharge
and others haven't yet, an effect of back-flow occurs which burns out those
cells.

Well, well. I have always tried to completely discharge the battery in
my laptop before charging it; maybe I shouldn't.

There is another problem with all batteries, (a problem of the charging
circuits actually) that if they are charged too fast they will over heat
which damages them. The second problem is that none of the batteries like
to be over charged, something which usually isn't handled properly either
usually.

The integrated circuits may get out of sync with the battery (usually when
the battery degrades with age and the circuit isn't calibrated any more,
which causes false information, but doesn't effect performance). It is
sometimes recommended to discharge the battery completely when that happens
to recalibrate it, but isn't recommended on a regular basis with Li-ions.

My laptop's lithium ion had no clue what the percentage was. It would
stay between 100 and 50 percent most of the time, then drop suddenly to
0.

I read in a Popular Science magazine that freezing a battery may help.
I had little to lose as this battery was getting very bad, so I tried
it. ...It didn't work. Now the battery will charge, but seems to reset
every ten seconds or so; it flashes full and then goes back to <10%. It
holds absolutely no charge.

It is unfortunate that lithium ion batteries cost so much. To replace
this one costs more than what I gave for the laptop.


Try looking for batteries on ebay. I got an oem replacement from china for 65$
including shipping (took about 10 days). Locally they cost about 200$. The old
one was lasting about 40 minutes this one goes for over 4 hours (i rarely go
below 50% actually). It also claims to store more juice then it's rated for.
Don't know if that value is true though.




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