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Charger circuit

  • US 8,890,485 B2
  • Filed: 10/06/2009
  • Issued: 11/18/2014
  • Est. Priority Date: 10/06/2009
  • Status: Active Grant
First Claim
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1. A method to charge a battery by a charger circuit, comprising:

  • charging the battery by a first charging current and counting a predetermined maximum charging period; and

    after the predetermined maximum charging period and the battery has not yet reached a predetermined voltage in the predetermined maximum charging period, charging the battery by a second charging current, the second charging current being a predetermined non-zero constant low current which is lower than the first charging current to determine whether the battery is usable, that it is chargeable by a low rate and is not completely unchargeable.

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