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Apparatus and method for indicating remaining battery life in a battery powered device

  • US 4,743,831 A
  • Filed: 09/12/1986
  • Issued: 05/10/1988
  • Est. Priority Date: 09/12/1986
  • Status: Expired due to Fees
First Claim
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1. In a battery powered system which includes a portable battery powered device and a battery connected to said device for supplying electrical power thereto, the combination therewith of an apparatus for predicting the remaining useful life of the battery during the normal use discharge cycle of the battery, said apparatus comprisingdata storage means for storing a predetermined value representing the total number of usable hours expected to be obtained from a fully charged battery during a normal use discharge cycle,means for counting the number of hours of actual use of the battery,means for comparing the number of hours of actual battery use with said stored predetermined value to determine the number of hours of usable battery life remaining,means for displaying the thus determined remaining usable battery life, andmeans operable in response to the occurrence of a full discharge cycle of the battery in normal use updating said data storage means to store therein as said predetermined value for the expected useful life of the battery in the next normal use discharge cycle, the value for the number of hours of use actually obtained from the battery in the current discharge cycle, so that subsequent predictions of the battery life will be based upon the immediate past history of actual battery life.

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