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Which symptom indicates persistent undercharging?

  • A.A battery repeatedly low in charge with sulphated plates
  • B.A strong smell of acid, which is produced by the gassing that accompanies an insufficient charging voltage
  • C.A bulging case
  • D.Rapid loss of electrolyte, which occurs because the low voltage allows the water to evaporate from the cells

Answer: A

A system charging too low leaves the battery permanently partly discharged, which sulphates it and shortens its life. Gassing, bulging and water loss all belong to overcharging, which makes them recognisable as the opposite fault. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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