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Method and apparatus for predicting end of battery life

  • US 7,737,581 B2
  • Filed: 06/06/2006
  • Issued: 06/15/2010
  • Est. Priority Date: 08/16/2005
  • Status: Active Grant
First Claim
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1. A method of providing backup power to a portable electronic device having a primary battery and a backup battery, the method comprising:

  • monitoring a battery level of the primary battery of the portable electronic device;

    generating a first signal to cause the primary battery to be disconnected if the battery level of the primary battery is less than a low battery threshold voltage; and

    generating a second signal to cause the backup battery of the portable electronic device to provide power for the portable electronic device, wherein the backup battery is configured to be charged by the primary battery and provides power for operating the portable electronic device with full feature functionality for a period of at least 24 hours.

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