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Method and apparatus for indicating a low battery level

  • US 9,488,695 B2
  • Filed: 12/15/2014
  • Issued: 11/08/2016
  • Est. Priority Date: 12/17/2013
  • Status: Expired due to Fees
First Claim
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1. A method for determining the battery level of a rechargeable battery (3) used in a battery-driven apparatus (1) for driving a load (2) and for indicating a low battery level after a last charging, the method comprising a repeating measurement of the battery voltage and a determination of a threshold for indicating the low battery level, wherein the running time of the apparatus (1), while driving the load (2), is accumulated since the last charging, the accumulated running time is repeatedly stored as sequenced data-logger entries (9) in a data-logger memory (7) until a reset of the apparatus (1) due to insufficient battery capacity or until charging of the battery (3), and wherein the threshold is determined after a reset of the apparatus (1) based on the data-logger entries (9) and a required remaining running time of the apparatus (1) upon indication of low battery level.

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