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Method for charging secondary battery and charger used therefor

  • US 5,576,608 A
  • Filed: 05/03/1994
  • Issued: 11/19/1996
  • Est. Priority Date: 05/14/1993
  • Status: Expired due to Term
First Claim
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1. A method for charging a secondary battery wherein the secondary battery is charged with a constant current and then additionally charged with a constant voltage equal to a full charging voltage, said method comprising the steps of:

  • detecting a voltage across said secondary battery while said secondary battery is being charged with said constant current;

    starting a timer when said detected voltage is equal to said full charging voltage;

    charging said secondary battery with said constant current until a predetermined period of time lapses in the timer from the time when said detected voltage becomes equal to said full charging voltage; and

    further charging said secondary battery with said constant voltage after a lapse of said predetermined period of time.

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