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More  Astable Oscillator Circuits    Battery Testers

Button Battery Cell Internal Resistance Measurement Circuit 
 

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

Circuit Small Button Battery Cell Internal Resistance Tester designed by David A. Johnson

More  Astable Oscillator Circuits    Battery Testers

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