Discussion
Which charger suits long term battery maintenance?
Answer: A
A smart charger reduces to a float voltage once charged and can be left connected indefinitely. An unregulated trickle charger overcharges eventually and boils the electrolyte away, which is precisely why the last option is a trap. Naming what changes and what stays the same is the reliable route through questions of this shape. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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