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Depth of discharge is the fraction of a battery's capacity that has been

  • A.withdrawn from it
  • B.left remaining in it
  • C.lost to self discharge
  • D.lost permanently through ageing

Answer: A

Correct answer: withdrawn from it

Depth of discharge is the fraction taken out; state of charge is the fraction remaining, and the two sum to one. A cell at 30 per cent depth of discharge is at 70 per cent state of charge. The distinction matters because cycle life is quoted against depth of discharge, and a battery cycled shallowly lasts far longer than one cycled deeply.

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