Electronic battery condition tester

  • US 6,768,309 B2
  • Filed: 11/25/2002
  • Issued: 07/27/2004
  • Est. Priority Date: 11/25/2002
  • Status: Active Grant
First Claim
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1. A battery condition tester for a battery having positive and negative terminals, said battery condition tester comprising:

  • means comprising a circuit for providing a constant current load between said terminals, and means for periodically switching said constant current, on and off, and means comprising a separate detection circuit including;

    amplifier means coupled to output positive and negative terminals to amplify the AC battery voltage resulting from the switched battery current;

    rectifier means for providing a DC voltage derived from said AC component of switched battery voltage;

    integrator circuit means for providing an output signal inversely proportional to the value of said DC voltage. indicator means responsive to said output signal.

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