On Fri, Jul 30, 2010 at 5:08 PM, Christian Jaeger <chr...@gmail.com> wrote:

> 2010/7/30 Mark <mamar...@gmail.com>:
> > Or do you shutdown  when the battery
> > reaches, say, 5%?
> >
> > I just ordered a few laptop battery replacements
>
> I guess you're talking about Lithium ion or Lithium polymer batteries
> (as all modern devices are using either of those)? Then you do rather
> *not* want to deep discharge them often, or at least not leave them in
> this state for a long time. They are said to live longest when about
> half full. Unlike NiCd batteries they exhibit no memory effect, so
> there is no use for deep discharge except occasionally to let the
> electronic fuel gauge recalibrate itself so that the displayed charge
> percentage is correct. Aside keeping them half full and keeping them
> at cool temperatures, you can do nothing to prevent those batteries
> from loosing capacity over time, they age whatever you do.
>

Thank you Christian.  Correct, Li-ion is the discussion here.  So is there a
way to keep the battery in the laptop, without it charging to 100%?  Both
machines in this case are Dell's, one Inspiron and one XPS, both 5+ years
old.

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