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Battery charger with battery life judging function

  • US 7,800,343 B2
  • Filed: 07/11/2006
  • Issued: 09/21/2010
  • Est. Priority Date: 07/12/2005
  • Status: Expired due to Fees
First Claim
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1. A battery life judging device comprising:

  • a battery voltage detecting unit that detects a first battery voltage before charging of a battery begins and second battery voltages at a first time and at a second time subsequent to the first time, wherein both said first time and said second time are subsequent to a time when charging of the battery begins;

    a memory that stores the first battery voltage and the second battery voltage detected by the battery voltage detecting unit;

    a battery voltage gradient calculating unit that calculates a battery voltage gradient from the second battery voltages detected by the battery voltage detecting circuit at said first and second times; and

    a judging unit including first means for judging if the first battery voltage exceeds a predetermined voltage and second means for judging if the battery voltage gradient exceeds a first prescribed value,wherein the judging unit judges that a life of a battery has expired when the first battery voltage does not exceed the predetermined voltage and the battery voltage gradient exceeds a first prescribed value.

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