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gauge bq27541 with battery charged

micou ludovic
Expert 1215 points
Other Parts Discussed in Thread: BQ27541

I have a bq27541 use with a battery charged. The battery is not requested by the system. it is used only in case of emergency. Is it necessary to plan a regular discharge of the battery so that the gauge works correctly?

  • 0
    TI__Genius 14985 points

    Hi Micou,

    The gauge will sit at 100% indefinitely, but over time even a fully charged battery will degrade and the impedance will increase.  In order for the Impedance Track gauge to learn the new higher impedance and give proper predictions of available capacity and run-time it will need to periodically see at least a partial discharge of your battery.

  • 0 in reply to dMax
    Expert 1215 points

    Of how much it is necessary to unload the battery and all how long for to have a predictions of avaible capacity?

  • 0 in reply to micou ludovic
    TI__Genius 14985 points

    I may not fully understand your question.

    It will predict available capacity always, but it just might not be that accurate after the battery has aged but never been cycled.

  • 0 in reply to dMax
    Expert 1215 points

    in your precedent message, you write "In order for the Impedance Track gauge to learn the new higher impedance and give proper predictions of available capacity and run-time it will need to periodically see at least a partial discharge of your battery". what is the periodically and the partial discharge?