Olin Lathrop said:
However, an N
> cell is 28.5mm long, and three of my button cells are only 16.2mm long
> total. Were you using more button cells?  A spacer?  Perform some
> unnatural acts on the spring?

The spring can be stretched to accomodate 4 cells pretty well. For three
cells I added a spacer made from wooden dowel. For conductivity I added a
strip of aluminum tape.

Cheers,

Bob

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