A battery often requires adding extra water because of overcharging.

A battery often requires adding extra water because of overcharging.

• A. Overcharging
• B. Undercharging
• C. Normal aging
• D. Short-circuiting

Answer: (A)

Overcharging causes water loss through electrolysis of the electrolyte. When a lead-acid battery is charged with too much voltage, water in the electrolyte is split into hydrogen and oxygen gases, which vent away. This reduces the actual water content inside the cells, so the liquid level drops and you end up needing to add distilled water to restore proper levels. Normal charging at the correct voltage shouldn’t drive this water loss, and undercharging simply doesn’t push the water out; aging affects capacity and sulfation more than immediate water depletion. Short-circuiting can cause overheating and damage, but the specific reason water is added after overcharging is the electrolysis-driven water loss.

Overcharging causes water loss through electrolysis of the electrolyte. When a lead-acid battery is charged with too much voltage, water in the electrolyte is split into hydrogen and oxygen gases, which vent away. This reduces the actual water content inside the cells, so the liquid level drops and you end up needing to add distilled water to restore proper levels. Normal charging at the correct voltage shouldn’t drive this water loss, and undercharging simply doesn’t push the water out; aging affects capacity and sulfation more than immediate water depletion. Short-circuiting can cause overheating and damage, but the specific reason water is added after overcharging is the electrolysis-driven water loss.