Discussion
The C-rate of a battery expresses its current as a multiple of
Answer: C
Correct answer: its rated capacity in ampere hours
The C-rate normalises current to capacity, so 1C is the current that would discharge the battery in one hour, 0.5C in two hours, and 2C in half an hour. Expressing the current this way makes limits comparable between cells of any size, which is why manufacturers specify maximum charge and discharge rates in C rather than in amperes.
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