Backup "batteries" installed
Dr. H. Nikolaus Schaller
hns at goldelico.com
Sat Oct 30 09:03:57 CEST 2010
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
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