Backup "batteries" installed
ben_deering at swissmail.org
Fri Nov 5 02:23:16 CET 2010
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.
On 10/30/2010 03:03 AM, Dr. H. Nikolaus Schaller wrote:
> Am 29.10.2010 um 19:05 schrieb Benjamin Deering:
>> 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!
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