Button Cell Replacement II

I tried the AAA cell for button cell switch with the thermometer / hygrometer mentioned yesterday:

 

https://wb9kzy.blogspot.com/2025/01/button-cell-replacement-idea-fail.html 

 

another magnet on the back of the holder

I forgot that the readout is in degrees C though.  The large number is the humidity, the small number is the temperature.

(Taken the next day) added two more hygrometers and the white thermometer:

The cell holders were all reused, even if the cells leak they will be a lot easier to replace than cleaning the actual unit.  I don't understand why the button cells were paralleled in the first place, seems an odd way to try to gain longer life.  The measurements do agree fairly well ?

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm