Re: Battery life on an iBook rev 2.2
> > I don't understand what is occuring. Mine goes for about 3h30-4h00, with
> > low backlight. Maybe your battery is badly calibrated
>
> Is there a way to re-calibrate the battery then? FWIW, the battery
> usage seemed just fine under OSX. The testing I did was with the
> backlight on the lowest possible settings.
Recalibration may be done by resetting the PMU on some models (not sure if
that works on iBooks). Another method seems to be draining the battery all
the way (keep running until the machine is forced into sleep with MacOS;
perhaps until the power manager cuts power without pmud et al. runnning in
Linux), then recharging longer than usual. I find the battery capacity is
overestimated after one such cycle, maybe doing this multiple times can
improve things.
For more information just hot google with 'powerbook battery
recalibration' ...
>
> > >flags : 00000011
> > >charge : 21768
> > >max_charge : 21886
> > >current : -1174
> > >voltage : 11674
> > >time rem. : 66750
> >
> > This is odd also : mine looks like :
> > flags : 00000011
> > charge : 4125
> > max_charge : 4147
> > current : -1163
> > voltage : 11947
> > time rem. : 12768
> >
> >
>
> There seems to be quite the difference between yours and mine,
> specifically the charge, max_charge, and time remaining. I wonder if
> this is causing a miscalculation somewhere.
max charge of 21000 is just insane. If this persists over a pmu reset I'd
like to see the PMU version info plus some raw data returned by the smart
battery ioctl ...
Michael
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