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Battery diagnostic method and apparatus

  • US 5,977,750 A
  • Filed: 04/20/1998
  • Issued: 11/02/1999
  • Est. Priority Date: 04/20/1998
  • Status: Expired due to Term
First Claim
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1. A method of monitoring the health and condition of a battery in an electrical system, comprising the steps of:

  • a) initiating a battery discharge by reducing the voltage supplied by a main power supply from a normal voltage level to a predetermined first voltage level;

    b) sensing a system voltage level supplied by a battery power supply greater than said first voltage level;

    c) further reducing the voltage supplied by the main power supply to a predetermined second voltage level;

    d) monitoring battery parameters indicative of battery performance during the battery discharge; and

    e) terminating the battery discharge by increasing the voltage level supplied by the main power supply to said normal voltage level.

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