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Which measurement indicates a battery approaching the end of its life?

  • A.A rising open circuit voltage, which indicates that the internal resistance of the battery has increased with age
  • B.A steady voltage
  • C.An increase in the specific gravity, which shows that the acid has become concentrated as the water is lost
  • D.A falling conductance or capacity against the rating

Answer: D

Testers report measured against rated cold cranking amps, and a figure well below rating signals replacement. Water loss genuinely does concentrate the acid, which makes the last option a real phenomenon with the wrong significance. Naming what changes and what stays the same is the reliable route through questions of this shape. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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