[Coco] Survey of Coco realtime clock users

Arthur Flexser flexser at fiu.edu
Fri Nov 30 23:15:29 EST 2007

A clever work-around for "replacing" a hard-to-replace battery.  Nice!


On Fri, 30 Nov 2007, Robert Gault wrote:

> Arthur Flexser wrote:
> > Out of curiosity, how'd you go about replacing the battery?  It looked like the
> > battery was potted in epoxy or something and not at all easy to replace.  On the
> > other hand, it was rated to last 10 years.  How long did yours hold out for?  I
> > never heard of a case of one finally giving out.
> > 
> > Art
> > 
> Not sure exactly when I bought it but a expect at least 10 years ago.
> Right the battery is potted and I doubt it would be safe to try to 
> remove the epoxy. I measured the voltage on the exposed DS1216 leads and 
> found several with about 1vDC. The battery is a lithium and should be 
> about 3vDC.
> Marty Goodman posted some suggestions on replacing the battery but I'm 
> not sure he actually did it. While one should remove the battery from 
> the circuit, I decided placing a new one in parallel would be sufficient.
> Radio Shack has all lithium batteries at the same price so I bought the 
> largest one, about 5 to 6 times larger than the one in the Smartwatch. 
> Should last 50-60 years :)  Solder connected it to DS1216 pin4 +v and 
> pin8 ground. Pre-tested this with two dry cells in series.
> Works great!
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