What will be the freezing point of the electrolyte in a fully charged lead-acid battery as compared to a discharged battery?

Correct Answer: Option B — lower than in a discharged battery

In a fully charged lead-acid battery, the electrolyte is a stronger sulfuric acid solution, which has a significantly lower freezing point than the diluted, water-heavy electrolyte found in a discharged battery. This physical property prevents electrolyte freezing in cold environments when the battery maintains a high state of charge.