[Elecraft] battery power for backup

[Jim Wiley]

Thanks to everyone for the suggestions.  Unfortunately, physical size is 
an issue, which is why I mentioned the coin cells.  I don't know if a 
coin cell holder will fit in the available space, and I had thought of 
that possibility, but I will investigate further. The cells can be no 
larger than the 2032 size. However, I will investigate mounting the 
memory cells at another location inside the set and running wire leads 
to the original  location. One of my applications is inside a FT-100D 
transceiver.  Other sets probably have more "elbow room" and for those 
the battery holder is a good idea.  And yes, I can purchase coin cells 
in any size or quantity I want at the local market, but none that have 
solder tabs or PC-mount pins.  Thanks again for your suggestions.

We now return you  to your regularly scheduled reflector.

- Jim, KL7CC


On 11/1/2012 7:38 PM, Steve Jackson wrote:
> Jim
>
> I saw some incorrect answers fly about on the Elecraft reflector. One 
> was good:  to buy the cell holder and then buy the CR2032 or similar 
> cells at the drugstore.
>
> Another answer you didn't get is to use a pair of L91 AA cells in 
> series.  If you download the spec sheet for that cell you will be 
> /astounded /that we have a commercial product widely available in the 
> consumer market that is THAT terrific.  Look at the longevity, pulse 
> ampacity, temperature specs, etc., all simply amazing.  Will blow away 
> any other solution at 12 years plus.
>
> http://data.energizer.com/PDFs/l91.pdf
>
> There are programs you can use to calculate a Joules-reduction to show 
> how long your service life will be but basically for back up you're 
> limited by shelf life specs and also the ability of the contacts in 
> the cell holder to maintain ohmic integrity.
>
> Steve  KZ1X/4