Eastburn wrote:
THey were developed for war time bombs in the mid 60's. e-cells iirc.
I got some early data sheets as I did some consulting with consults.
(A strain gauge for Helicopters keeping from picking up to heavy a
load.)
[ that was a physics nightmare - twisting, bouncing load that might be
to much of a load or just enough.]

They are pretty much identical to (for example) AA cells, just smaller.
You can buy very similar cells in continuous size ranges from well over
D cell size to smaller than 1/3AAAA.
And then you get button cells, that go from around 6*2mm on.