Discussion
Match each fault with its evidence.
List I
A. Overcharging
B. Undercharging
C. Sulphation
List II
P. permanently low state of charge
Q. electrolyte loss and acid smell
R. hard crystals reducing capacity
Select the correct match.
Answer: D
Overcharging boils the electrolyte away, undercharging leaves the battery permanently low, and sulphation is the crystallisation that follows from standing in that condition. The three are linked but distinguishable. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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