http://www.bealecorner.com/trv900/lithium.html
Rod wrote:
> > There are 2 things here:
> >
> > The fact that the time does not hold suggests that the PRAM internal
> > battery > needs replacing. According to my copy of Mactracker it should be
> a
> > Lithium ion.
> >
OOPS ! I GOOFED ! SORRY, I READ THE WRONG LINE !
BUT This is still correct
>Two years is not an unusual life time for these. ( Lithium ion Batteries )
You could try reading
<http://www.bealecorner.com/trv900/lithium.html>
and Batteries in a Portable World Chapters 10 & 15 @ :-
<http://www.buchmann.ca/>
AND THIS STILL MAY BE OF HELP
Courtesy of Macintouch,
Two readers shared stories about resuscitating Mac laptop batteries in
Mac OS X:
[Rob Wyatt] I'd like to share a recent experience with my iBook (white,
dual USB, 600mHz). I hadn't used it in a few weeks and when I turned it
on, the battery was completely dead. I booted up the machine and was
very surprised to find that the battery wasn't even recognized. There
was a little "X" over the battery icon in the menubar (OS X 10.2). I
attempted to re-seat the battery, zap PRAM (using the key combo upon
startup), and reset the Power Manager. Nothing worked. So I called tech
support and they had me do all of those things over again. Finally they
agreed to send me a new battery.
In the meantime, I decided to try one other thing (after reading
about iBook battery issues somewhere online). I booted into Open
Firmware and typed "reset-nvram", followed by "reset-all". Surprise,
surprise...my battery came back to life and recharged fine. Too bad
Apple tech support didn't tell me to try this!
I figured I'd share this experience in case anyone else out there is
having a similar problem.
[David M. Barnett] I have a Wallstreet Powerbook G3 266 which has been
upgraded to 384MB RAM and 40GB hard drive. I also have a brand new
battery from APS.
After upgrading to System X 10.2.3 I noticed a problem develop with
my battery which persisted even after upgrading to System 10.2.6:
After a few charge/discharge cycles the battery would apparently stop
charging at less than 100%. The percentage would decline rapidly with
time (reaching as low as 50% before I found what appears to be a cure).
The battery voltage reported when charging stopped was high, but the
battery would go into automatic sleep when it hit 0% capacity (even
though the reported voltage was still quite high.
I suspected that the battery's intelligence and the OS use of the
power manager were somehow clashing.
To test this I rebooted in System 9.2.2 and cycled the battery with
no apparent improvement.
I then reset the power manager and cycled the battery again (still in
System 9) with a full charge/discharge cycle. VOILA! The battery now
charges to 100% in System X.
I am currently cycling it in System 10.2.6 to see if the problem will
recur. Since I have read of problems people have had with batteries even
on newer systems, this may be of general interest to powerbook owners.
>
> >
> > Then there is the external battery that normally powers the iBook when
> > the
> > mains are disconnected.
> >
> > The following may help
>
> There is a good reason the PRAM battery is lithium ion - it is the main,
> external battery :-) Not one iBook model has had a PRAM battery, so keep
> that in mind when the battery goes bung.
>
> Has the iBook been predominantly run from mains in its life? If so, the
> battery has 'forgotten' where the rest of the cells are, so it only charges
> the top little bit that gets discharged when the power mains in
> disconnected. In a 'previous life', I had a number of 500Mhz vintage iBooks
> come in with the same problem. And 99% of them ran most of the time with
> the mains connected. Drop it in to a service centre and get it checked out.
> Most likely a battery, but there is always a chance that it is something
> else on the logic board.
>
> Tip for the day - especially with iBooks, make sure you run the battery up
> and down regularly (say once a week). They're desgined to run off a
> battery. It won't hurt your laptop ;-)
>
> Seeya
>
> Rod!
>
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