Storage battery condition tester utilizing low load current

  • US 4,719,428 A
  • Filed: 06/04/1985
  • Issued: 01/12/1988
  • Est. Priority Date: 06/04/1985
  • Status: Expired due to Fees
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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 switching circuit for periodically switching on and off a low constant current load between said battery terminals through a first set of battery terminal contacts; and

    means comprising a separate detection circuit including;

    first amplifier means coupled to said positive and negative terminals through a second set of battery terminal contacts to amplify the AC component of the battery voltage resulting from the switched battery current;

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

    means for providing an output signal related to battery condition as determined by said DC voltage; and

    indicator means adapted to provide a reading indicative of the value of the battery voltage under heavy load.

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