Backup "batteries" installed

[Benjamin Deering]

I have had the capacitors installed for a few days now and they are 
still working well.  I left the FR with a dead battery overnight and 
when I plugged it in in the following day, it had the correct time.

The digikey part number is: 728-1037-1-ND and the manufacturer's number 
(seiko) is: XH414H-II06E.  I would recommend looking around on the site 
to see if you can find one with the correct bracket.

Ben

On 10/30/2010 03:03 AM, Dr. H. Nikolaus Schaller wrote:
> Am 29.10.2010 um 19:05 schrieb Benjamin Deering:
>
>    
>> Hello,
>>
>> I finished installing capacitors as replacements for the dead backup
>> batteries in my Freerunners today at lunch.  They seem to be working,
>> though I've only tried removing the main battery for under a minute so
>> far.  Someone on the GTA-02-core list said a 220uf capacitor would power
>> the RTC for 2 minutes.  If that is correct, the .07f caps I used should
>> work for about 10 hours.
>>      
> Please report some test results.
>
>    
>> The parts I got from digikey weren't an exact fit, but I was able to
>> make them work.
>>      
> Looks interesting. Do you have the exact order number at DigiKey?
>
>    
>> Be sure to wear safety glasses if you try this, I had one of the old
>> batteries explode when I was removing it.
>>      
> Oops! So it was not really dead an had enough energy inside. Maybe,
> just the voltage was too low to run the RTC?
>
>    
>> Pictures: http://jeepingben.homelinux.net/index.php?level=album&id=20
>>      
> Good work!
>
> Nikolaus
>
> _______________________________________________
> Openmoko community mailing list
> community at lists.openmoko.org
> http://lists.openmoko.org/mailman/listinfo/community
>
>