[Gta04-owner] bq27000-battery: battery is not calibrated! ignoring capacity values

Sven Dyroff S.Dyroff at phytec.de
Tue Feb 5 10:06:52 CET 2013


I made some further tests with Qtmoko v52 and found that it's not 
necessary to "calibrate" the battery by stressing it through needless 
discharging/recharging cycles. In order to get a working battery indicator 
again, it's sufficient to use Qtmoko v52 together with the 3.2 kernel from 
Qtmoko v47. It works well, except that the modem will not be recognized. 
But you can play games like QtMaze for example.

So simply set up your SD card in a way, that you use the scripts 1.sh and 
2.sh for toggling between former 3.2 and current 3.7 kernel. This allows 
you to decide with only one touch during boot if you wanna see a working 
battery indicator or if you wanna have a working phone. This should work 
fine until the broken driver within the kernel had been repaired.

Best regards

Von:    Neil Jerram <neil at ossau.homelinux.net>
An:     List for communicating with real GTA04 owners 
<gta04-owner at goldelico.com>
Datum:  05.02.2013 00:41
Betreff:        Re: [Gta04-owner] bq27000-battery: battery is not 
calibrated!     ignoring capacity values
Gesendet von:   gta04-owner-bounces at goldelico.com

EdorFaus <edorfaus at xepher.net> writes:

> On 02/04/2013 07:06 AM, NeilBrown wrote:
>> On Sun, 03 Feb 2013 22:47:03 +0100 EdorFaus <edorfaus at xepher.net> 
>>> The problem is that, since we haven't seen the datasheet or any other
>>> relevant information, we don't actually know what that calibration
>>> procedure is supposed to be.
>> Datasheets can be found.  e.g.
>> http://www.ti.com/lit/ds/symlink/bq27200.pdf
> Ah, thank you! I'm apparently no good at that.
> If I read this correctly, the calibration is specified to happen
> automatically whenever the battery goes from a full charge to
> completely empty in one go, which is basically what I thought.
> Nice to see that confirmed by official documentation.

That's also consistent with my experience.  FWIW what I experienced was
that my previously happy and relatively new battery somehow lost its
calibration.  Then I charged it as much as I could, and then ran the
battery down as fast and quickly as I could, all the time with the
battery page of QtMoko's NeoControl application open.  What I saw was
that the calibration came back - i.e. the 'charge_full' value - when the
'charge_now' value was going down linearly and within a minute of
hitting zero.

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