Discussion
Limiting the depth of discharge of a battery
Answer: B
Correct answer: extends its cycle life at the cost of usable capacity
Cycle life rises steeply as the depth of discharge is reduced - a lithium ion cell cycled to 80 per cent may last a few thousand cycles, and one cycled to 20 per cent tens of thousands. The price is that a larger battery must be bought to deliver the same usable energy. The economic optimum balances the two, and it is why a storage system is almost always specified with a usable capacity well below its nameplate.
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