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Battery pack including static memory and a timer for charge management

  • US 5,514,946 A
  • Filed: 03/19/1993
  • Issued: 05/07/1996
  • Est. Priority Date: 03/19/1993
  • Status: Expired due to Term
First Claim
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1. A removable battery pack for providing power to a computer system, the computer system including a microcontroller for detecting when said battery pack is connected to the computer system, means coupled to the microcontroller for determining the amount of charge provided to and provided by said battery pack while said battery pack is connected and computer system communication means coupled to the microcontroller for communicating with said battery pack, said battery pack comprising:

  • a rechargeable battery;

    a real time clock coupled to said battery for continually providing an indication of the present time; and

    memory coupled to said battery for storing a timestamp value of said present time indication and a numerator value representing the remaining charge of said battery at approximately the time indicated by said timestamp value,wherein the microcontroller detects said battery pack when it is initially connected to the computer system, retrieves said present time indication and said timestamp and numerator values, and thereafter periodically updates said numerator based on the amount of charge provided to and provided by said battery and also updates said timestamp value with said present time indication while said battery pack is connected to said computer system.

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