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The open cell voltage of a
small silver oxide button cell battery remains very close to 1.5 volts over most of
the life of the cell. However, there is a relationship between battery health
and the internal resistance of the cell. This circuit when used in conjunction
with an oscilloscope will measure the internal resistance. You will have to use
a known good cell as a reference.
Click
on Drawing Below to view PDF version of Schematic
