What is automotive batteries are which hazard class?

Automotive batteries, specifically lead-acid batteries, are classified as Hazard Class 8: Corrosives under the United Nations (UN) classification system.

This classification is primarily due to the presence of sulfuric acid, a highly corrosive electrolyte, within the battery. Sulfuric acid can cause severe burns to skin, eyes, and other materials.

Additionally, automotive batteries can produce hydrogen gas during charging and discharging. Hydrogen is a flammable gas and can create an explosion hazard if allowed to accumulate in a confined space. The battery posts also contain lead, which is toxic and a heavy metal. Proper handling and disposal are crucial to mitigate these risks, and are also covered by hazard class 9 and 6.1.