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Which effect does deep discharging have on a starter battery?

  • A.It has no effect, since the battery is designed to be discharged fully and recharged during ordinary use
  • B.It improves capacity
  • C.It causes the electrolyte to freeze, which is the mechanism by which the plates are damaged during a deep discharge
  • D.It shortens the life considerably

Answer: D

A starter battery has thin plates for high current and tolerates only shallow cycling, so repeated deep discharge destroys it. A discharged battery genuinely does freeze more readily, which makes the last option a real secondary hazard. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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