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A coulomb counter is preferred for a battery-life measurement because it

  • A.requires no series element in the supply
  • B.integrates the charge actually taken over a long period
  • C.measures the peak current with high bandwidth
  • D.reports the capacity remaining in the cell directly

Answer: B

Integrating over hours or days captures every wake-up, every retry and every rare event that a short capture would miss, and the total charge is exactly what the cell must supply. It says nothing about the peaks, which still need a fast measurement.

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