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Self-discharge limits the useful life of a design drawing

  • A.a few microamperes or less
  • B.a few milliamperes
  • C.any current at all, equally
  • D.current only in short pulses

Answer: A

A lithium coin cell loses a per cent or two a year, which is a few microamperes' worth spread over the year; a design drawing less than that is limited by the chemistry rather than by its own load. Predicted lives beyond about ten years are therefore not credible.

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