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Battery Tester Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Friday, July 18, 2008 11:34 AM

Master Category List - Dave's Circuits
 
  • 6v NMH/NiCd Battery Tester
    I designed this circuit to test rechargeable six volt battery packs under constant current conditions.  As designed, the circuit applies a 10 amp load to the battery pack.  A heat sink must be used on the main power transistor. 
  • 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.


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