Apparatus and method for protecting a battery from overdischarge

  • US 6,888,468 B2
  • Filed: 01/22/2003
  • Issued: 05/03/2005
  • Est. Priority Date: 01/22/2003
  • Status: Active Grant
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First Claim
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1. A battery discharge indicator, comprising:

  • a positive connector configured to couple to a positive terminal of the battery;

    a negative connector configured to couple to a negative terminal of the battery;

    a voltage sensor configured to couple to the battery via the positive connector and the negative connector and to sense a battery terminal voltage; and

    a microprocessor, coupled to the voltage sensor, configured to provide, substantially independently of a load being applied to the battery, a first alarm signal if a magnitude of the battery terminal voltage is below a first threshold voltage level for a first time interval and if the magnitude of the battery terminal voltage is below a second threshold voltage level for a second time interval.

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