Practice question

A school bus diesel battery system uses multiple batteries in parallel. One battery has a bad internal cell. The MOST likely effect on starting is:

  1. Improved cranking performance
  2. No effect because the others compensate fully
  3. Reduced overall available cranking current and slow/hard cranking, and the bad battery can drag down the good ones
  4. Higher charging voltage at the alternator

Answer: C — Reduced overall available cranking current and slow/hard cranking, and the bad battery can drag down the good ones

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