XO power management

[Pablo Iguiniz]

Hello Richard,

This is Eng. Javier Iguiniz from Ceibal. Ismael has recently changed work so
I am now taking over part of his tasks, in particular the testing related to
the XO batteries.
I tried to catch up with the plan, so we have carried the test to another
batch of batteries we had here. The initial batch had 50 batteries and there
was all kind of them: newer and older from different years.
>From the 50 units only 28 remained functional, meaning that they could
accoplished the full charge/discharge test cycle. The damaged batteries
showed different problems, which I list below:

Battery not recognized  - "No Battery" reported , LED does not light up.
Battery recognized but error message is shown, red LED blinks
Bad data retrieved from EEPROM
Never finishes trickle mode
Battery appears as full but doesn´t allow the XO to start
Initial tricke mode, does not charge after recover phase

>From those 28 functional batteries I´m ataching a zip file with data
collected and a file with the batteries status summary . I hope you could
find it useful.You may find some files which have a minor data process or
include a graph.
At the moment we don´t have many more batteries left. I will try to find
some more from now on.

I saw that there was another side on the investigation regarding the
information of charge and discharge cycles collected  in EEPROM. I would
like to know if you had any chance to go further on this point.

Best regards,
Javier.





XO power management *Richard A. Smith* richard at laptop.org
<devel%40lists.laptop.org?Subject=XO%20power%20management&In-Reply-To=BANLkTint1KMSrQefHqhd12k4WF0VYb1%3Duw%40mail.gmail.com>
*Tue Apr 5 11:49:31 EDT 2011*

   - Previous message: XO power management
   <http://lists.laptop.org/pipermail/devel/2011-April/031712.html>
   - Next message: New XO 1.5 firmware with MPPT. Please test!
   <http://lists.laptop.org/pipermail/devel/2011-April/031705.html>
   - *Messages sorted by:* [ date
]<http://lists.laptop.org/pipermail/devel/2011-April/date.html#31715>
[
   thread ]<http://lists.laptop.org/pipermail/devel/2011-April/thread.html#31715>
[
   subject ]<http://lists.laptop.org/pipermail/devel/2011-April/subject.html#31715>
[
   author ]<http://lists.laptop.org/pipermail/devel/2011-April/author.html#31715>

------------------------------

On 04/05/2011 09:33 AM, Ismael Schinca wrote:
>* Thanks! This is very useful information. I'll try to run some new tests
*>* and try to look at the data more thoroughly. The new batteries' capacity
*>* is pretty puzzling. I'll repeat the tests on these batteries and add a
*>* couple more of new ones to get more results.
*
Please continue to run the test on your other batteries as well.  More
data is better than lest data.  Grab  as many XO's as you can and run
new tests daily on your stock of batteries.

>* I think it's a good idea to think about discarding the 07 batteries.
*>* They are pretty old anyways.
*
Even if you plan to recycle the < 008 batteries please continue to
include them in the your tests.  That way I can build up a profile of
what the _actual_ capacity loss over time vs my estimates.

-- 
Richard A. Smith  <richard at laptop.org
<http://lists.laptop.org/listinfo/devel>>
One Laptop per Child

------------------------------

   - Previous message: XO power management
   <http://lists.laptop.org/pipermail/devel/2011-April/031712.html>
   - Next message: New XO 1.5 firmware with MPPT. Please test!
   <http://lists.laptop.org/pipermail/devel/2011-April/031705.html>
   - *Messages sorted by:* [ date
]<http://lists.laptop.org/pipermail/devel/2011-April/date.html#31715>
[
   thread ]<http://lists.laptop.org/pipermail/devel/2011-April/thread.html#31715>
[
   subject ]<http://lists.laptop.org/pipermail/devel/2011-April/subject.html#31715>
[
   author ]<http://lists.laptop.org/pipermail/devel/2011-April/author.html#31715>

------------------------------
More information about the Devel mailing
list<http://lists.laptop.org/listinfo/devel>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.laptop.org/pipermail/devel/attachments/20110419/259329bc/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Charge- discharge tests.zip
Type: application/zip
Size: 3561518 bytes
Desc: not available
URL: <http://lists.laptop.org/pipermail/devel/attachments/20110419/259329bc/attachment.zip>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Battery Record.ods
Type: application/vnd.oasis.opendocument.spreadsheet
Size: 24679 bytes
Desc: not available
URL: <http://lists.laptop.org/pipermail/devel/attachments/20110419/259329bc/attachment.ods>