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Which outcome occurs in a sealed lead-acid battery near full capacity when applying a constant overcharge?

A)Gassing and water electrolysis increase
B)Plate sulfation becomes the dominant reaction
C)Internal resistance is minimized rapidly
D)Active material shedding ceases irreversibly

💡 Explanation

Gassing increases with overcharge because the electrochemical driving force exceeds the equilibrium potential for water electrolysis, forming hydrogen and oxygen via charge transfer; therefore, gassing occurs, rather than sulfation dominating because acid concentration remains high delaying equilibrium shift.

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