What happens when a battery is overcharged?

Overcharging a battery can indeed lead to various hazardous conditions, one of which is the potential release of gas. When a battery is charged beyond its designated capacity, the excess energy can cause a chemical reaction that generates gases, particularly in lead-acid batteries where hydrogen gas can accumulate. This accumulation can create pressure within the battery casing, and if that pressure is not released, it may pose a risk of explosion or venting.

Understanding this risk is critical. The correct response emphasizes that while overcharging may not directly cause an explosion, it significantly increases the risk of hazardous situations by generating gases and raising internal pressure. Controls such as venting mechanisms and proper charging practices are essential to prevent these potentially dangerous scenarios. Thus, the assertion that overcharging a battery does not cause it to explode directly overlooks the indirect hazards presented by gas accumulation and pressure buildup.