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The current a battery can sustain for thirty seconds at minus eighteen degrees while holding a defined voltage is its _____.

  • A.peak current, which is the momentary current available under a short circuit and is not a published rating
  • B.cold cranking amps
  • C.reserve capacity, which instead expresses the minutes for which the battery can supply twenty five amps
  • D.ampere hour capacity

Answer: B

Cold cranking amps is the rating that matters for starting, because it is measured at the temperature and duration that cranking actually involves. A replacement battery must meet or exceed the specified figure. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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