Backup "batteries" installed

Dr. H. Nikolaus Schaller hns at
Sat Oct 30 09:03:57 CEST 2010

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:

Good work!


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