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A battery is replaced on a stop start vehicle and the owner returns six months later with the same starting complaint, the new battery testing as heavily discharged.

Which omission is most likely?

  • A.The new battery was not registered with the energy management system
  • B.The alternator has failed, which would have produced a warning lamp and a discharged battery within a few days
  • C.The wrong battery type was fitted
  • D.A parasitic drain is present, which would have flattened the battery within days rather than over several months

Answer: A

Without registration the system charges for an aged battery and the new one is chronically undercharged, which takes months to show. The timescale rules out a drain or a failed alternator. Fitting the wrong type is the other real candidate. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once.

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