asus-ul30 team mailing list archive

[David Whittaker <dpwhittaker@xxxxxxxxx>]

A lithium ion battery is rated at 3.7V per cell.  However, all batteries
start above their rated voltage on a full charge, and end up below their
rated voltage when they are depleted.  For lithium ion, the operable range
is roughly 3.2V-4.2V.  So a lithium ion battery pack rated at 14.8V is
actually 4 lithium ion cells in series (3.7x4=14.8).  However, the operable
range of this pack is roughly 3.2-4.2 x 4 = 12.8-16.8V.  This is why you
see the higher than rated voltage, at least at full charge.
On Jul 31, 2012 6:22 PM, "Áron Cserkaszky" <cserkaszky@xxxxxxxxxxx> wrote:

> People reported 16-16.5V when on battery and 16.5-17V when on AC, so I
> guess all batteries are underrated (:)) because specs are either 15V or
> 14.4V.
> So I just buy a new battery and problem solved, but I still have no idea
> why (probably) 2 cells of my battery died with no warning clues.
> Thanks for the stats people.
>
> Aron
>
>
> On 22.07.2012 13:14, Áron Cserkaszky wrote:
> > Hey list
> >
> > I have a two years old UL30VT with the default 5600mAh battery, and the
> > battery stopped working now, meaning that it does not even switch on
> > when only the battery is present. I did some investigations and the only
> > unusal thing is the low battery voltage, instead of the 15V (according
> > to specs) acpi tells me that it outputs only 12616mV. (when its in the
> > machine but the AC is plugged in too)
> >
> > Could you run this command for me on your machines:
> > cat /proc/acpi/battery/BAT0/state | grep voltage
> > and then send me the result?
> >
> > I would appreciate it, because if your batteries have normal voltage
> > then I can rest in peace that the battery is to blame, and a buying a
> > new one from amazon will solve my problems.
> > Please write me in private and then after a few days I will reply to the
> > list with the stats of your answers.
> >
> > Thanks in advance
> > Aron
>
>
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