Re: [Phys-l] computers

[Joseph Bellina <jbellina@saintmarys.edu>]

Part of the problem here is that the charge level detector, doesn't  
detect anything.  As I understand it, it is an algorithm for  
predicting battery condition, so the period cycling serves to modify  
the parameters in the algorithm so the prediction is better.

cheers,

joe

Joseph J. Bellina, Jr. Ph.D.
Professor of Physics
Saint Mary's College
Notre Dame, IN 46556

On Aug 8, 2007, at 12:33 AM, Bernard Cleyet wrote:

> Apple thinks constant recycling if not as good as leaving it alone and
> using the external  P/S.   On mine if it's below 95% it charges to  
> 99% +
> and then disconnects the battery and stays disconnected 'till the  
> level
> drops below 95% from using w/ o the charger.  It recommends  
> occasionally
> discharging the batt. 'till the computer detects it's dangerously low
> and goes to sleep.  Then one plugs in the supply 'till it's fully
> charged.  This resets the charge level detector.
>
> bc, who still has a charger w/ an auto discharge function for thos  
> oldies.
>
> John Denker wrote:
>
> > > My tech guy also said it is best to charge the battery to 100%,  
> > > unplug,
> > > use the computer, and let the battery drain to nearly 0%, then  
> > > recharge
> > > again. He said this will extend the battery lifetime, rather than  
> > > to just
> > > keep the plug in all the time, or to not let the battery  
> > > completely drain
> > > before recharging.
> > >
> > > Thoughts?
> >
> > That's a myth.  It's a legend handed down from the days of NiCd
> > batteries that had bizarre memory issues.  Those days are long
> > gone.  Laptops don't use NiCd batteries anymore.  And FWIW modern
> > NiCd batteries are much better behaved.
> >
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