Battery capacity indicator

  • US 5,032,825 A
  • Filed: 03/02/1990
  • Issued: 07/16/1991
  • Est. Priority Date: 03/02/1990
  • Status: Expired due to Term
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First Claim
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1. A battery capacity indicator for providing a continuous indication of battery capacity for a battery powered device, comprising:

  • means for periodically effecting a first and a second positive discharge rate of the battery;

    voltage measurement means, for measuring the battery terminal voltage at said first and second positive discharge rates during the operation of the device, and for generating a differential battery voltage value in response thereto;

    memory means for storing a set of predetermined differential battery voltage values and a set of predetermined battery capacity values, each of the set of predetermined differential battery voltage values defining one of the set of predetermined battery capacity values;

    comparison means, coupled to said memory means and to said voltage measurement means, for comparing the measured differential battery voltage values with the set of predetermined differential battery voltage values, and for selecting the predetermined battery capacity value corresponding thereto; and

    display means, coupled to said comparison means, for displaying indicia indicating the selected predetermined battery capacity value corresponding to the current battery capacity.

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