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Which quantity does reserve capacity express?

  • A.The time for which the battery may be left standing before it must be recharged in order to prevent sulphation
  • B.Minutes a battery can supply 25 amps before dropping to 10.5 volts
  • C.The current available for cranking at low temperature, expressed in amps for a defined period of thirty seconds
  • D.Total stored charge

Answer: B

Reserve capacity is a practical measure of how long the vehicle can run on the battery alone if the alternator fails. Cold cranking amps covers the starting duty. Both figures appear on the battery label. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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