Method and apparatus for charging a lead-acid battery

  • US 5,656,920 A
  • Filed: 04/19/1995
  • Issued: 08/12/1997
  • Est. Priority Date: 10/13/1992
  • Status: Expired due to Term
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First Claim
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1. A method of charging a lead-acid battery which comprises providing a variable power supply to charge the battery with an applied voltage, periodically carrying out a voltage sweep through a predetermined range, detecting the applied voltage and current at multiple points as the voltage sweep is being carried out, detecting a slope based upon the applied voltage and current values detected during the voltage sweep that is substantially a maximum slope value, selecting a charging voltage for the battery being charged from the detected values for applied voltage and current wherein the selected voltage corresponds to a voltage greater than the voltage at the maximum slope value, and adjusting the variable power supply to provide the battery being charged with a charging voltage based upon the charging voltage value selected.

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