Bob Blick-4 wrote:
>=20
> The Windows battery meter ticked down normally until about seven
> percent. Then it stayed at seven percent for fifty minutes! After that
> it went down normally until it shut off.
>=20
> I let it cool for a couple of hours (I am a battery care nut so I will
> not charge a warm battery) and recharged the battery. The health LEDs
> now showed zero LEDs, 100 percent health, and Ubuntu's battry meter said
> I had more capacity, about 96 percent.
>=20

Thanks for the additional data point.

Interestingly I stumbled on the drain and recharge suggestion when trying t=
o
get some run time out of the battery pack I rebuilt.

My process consists of running the battery down to about 10%, rebooting the
machine into the BIOS utility, let the battery drain and the laptop shut
down, and then recharge with the laptop off.  Perhaps I should add your coo=
l
down period - but I'm too impatient.

Watching the battery status in the BIOS utility shows the percentage drop
until, like yours, it hits 7% and then it hangs there for a very long time.

Running this process three times has resulted in an increase from about 9 W=
h
to about 35 Wh for a 57 Wh rebuilt PT434 pack.

However, the pack LEDs show full capacity (all LEDs) with zero health (all
LEDs) and when I boot, I get a warning that while the battery can charge
normally, it needs to be replaced.


Bob Blick-4 wrote:
>=20
> Who knows what the microcontroller inside the battery is programmed to
> do, but in my case it learned enough to increase its predicted capacity.=
=20
>=20

I wish I had known about this undocumented battery gauge recalibration.  I'=
m
pretty sure that I didn't really need to buy a pack - all the cells I
removed seem to have a lot of life left in them.  Perhaps some day I will
take the time to quantify.

I'll probably run the drain and charge again.  It will be interesting to se=
e
if it continues to go up or if the battery gauge algorithm has some hard en=
d
of life parameter.

Regards,
Carl

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