Discussion
At that average current of 52 \( \mu \)A, a 220 mAh cell would last about
Answer: C
Dividing 220 milliampere hours by 0.052 milliamperes gives about 4230 hours, some six months. Self-discharge of the cell and the quiescent current of any regulator have still to be subtracted, and both are often comparable with the load.
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