State of charge indicator

  • US 4,520,353 A
  • Filed: 03/26/1982
  • Issued: 05/28/1985
  • Est. Priority Date: 03/26/1982
  • Status: Expired due to Fees
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First Claim
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1. A state of charge indicator for testing the state of charge of a battery selectively connected to an operating load, said state of charge indicator comprising means for sensing if the battery is connected to the operating load, timing means for sensing how long the battery is connected to the operating load, a test load, means for connecting said test load to the battery in response to indication from said load connection sensing means of disconnection of the battery from the operating load after indication from said timing means that the battery was connected to the operating load for a predetermined period of time, and means for producing in response to said test load being connected to the battery a signal indicating the state of charge of the battery.

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