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Battery monitor with wireless remote communication

  • US 20050151657A1
  • Filed: 08/23/2004
  • Published: 07/14/2005
  • Est. Priority Date: 06/19/2002
  • Status: Active Grant
First Claim
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1. A method for monitoring an operative condition of a battery, the method comprising the steps of:

  • injecting an ac signal across battery terminals;

    detecting an analog ac signal output from the battery, the ac signal output being proportional to the injected ac signals;

    determining the battery internal resistance based on the analog ac signal output and the injected ac signal;

    comparing the battery internal resistance with a threshold resistance to determine an operative condition of the battery.

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