Discussion
Which construction requires no topping up?
Answer: A
Calcium alloy grids raise the gassing voltage so little water is lost, and the cells are sealed. Antimony was the older alloy and gasses more. Recombination caps genuinely return some water, which makes the last option a real feature. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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