Discussion
An engineer reports a 20 year life from a coin cell for a design drawing 2 \( \mu \)A. The proper response is
Answer: B
A 220 mAh cell at two microamperes gives 110 000 hours of load, some twelve and a half years, but a self-discharge of one or two per cent a year exhausts it in about the same time whatever the load. Predicted lives beyond ten years are governed by chemistry, not by the design.
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