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Method for determining capacity of lead-acid batteries of various specific gravities

  • US 20060226845A1
  • Filed: 03/31/2005
  • Published: 10/12/2006
  • Est. Priority Date: 03/31/2005
  • Status: Active Grant
First Claim
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1. A method of determining a capacity of a lead-acid battery comprising:

  • applying a predetermined current ramp to a fully charged lead-acid battery while measuring a battery terminal voltage;

    determining an Iup, wherein the Iup is a transition current from charging to overcharging;

    determining a specific gravity of the lead-acid battery;

    determining the capacity of the lead-acid battery from the Iup using a correlation function that describes the relationship of the Iup to the capacity, wherein the correlation function depends on the specific gravity of the lead-acid battery.

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