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Method of measuring the battery level in a mobile telephone

  • US 7,696,724 B2
  • Filed: 08/14/2008
  • Issued: 04/13/2010
  • Est. Priority Date: 02/18/2000
  • Status: Active Grant
First Claim
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1. A method of measuring the voltage level of a mobile telephone battery during a charging operation comprising the steps of:

  • (a) applying current from a current source to charge the battery;

    (b) temporarily causing the current from the current source to cease, to enable the battery to enter a discharge mode;

    (c) measuring a voltage level of the battery when in the discharge mode;

    (d) re-applying current from the current source; and

    (e) repeating steps (b) to (d) until the measured voltage level exceeds one or more pre-determined voltage thresholds,wherein a battery level display on the telephone indicates the charge level of the battery in dependence on which the pre-determined voltage threshold or thresholds has or have been exceeded, andwherein the battery level display indicates a plurality of increasing battery charge levels, wherein each battery charge level corresponds to one of the one or more pre-determined voltage thresholds, wherein steps (a)-(e) are used to determine crossover of each pre-determined voltage threshold of each battery charge level except for a final highest battery charge level, and wherein the method further comprises using a current measurement to determine an end of the battery charging corresponding to the final highest battery charge level.

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