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Method for monitoring end of life for battery

  • US 20040073264A1
  • Filed: 10/07/2003
  • Published: 04/15/2004
  • Est. Priority Date: 09/15/1997
  • Status: Active Grant
First Claim
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1. A device, comprising:

  • a charge storage capacitor;

    circuitry connected to the charge storage capacitor, the circuitry including a battery terminal to connect to a battery for powering the circuitry in an episodic manner, the circuitry including;

    means to discharge the storage capacitor to a discharge voltage reference;

    means to charge the storage capacitor from the discharge voltage reference to a charged voltage reference;

    means to measure a charge time for the storage capacitor to determine the rate of charging from an initial voltage level that is larger than the discharge voltage reference to a final voltage level;

    means to determine a value for an internal impedance of the battery based on the rate of charging; and

    means to estimate the level of power depletion for the battery using the value for the internal impedance of the battery.

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