Batteries contain acid and can explode and/or catch on fire. In the event of a battery explosion or fire, acid and toxic fumes are released. When acid contacts the skin, extremely painful burns and scarring result. When these fumes are breathed, the lungs are burned from the toxic chemicals present in fumes. Blindness will likely result if this acid contacts the eye. These physical injuries are irreversible. Therefore, when working with batteries, it is important to prevent exposure by wearing personal protective equipment (PPE).