Why do car batteries explode?
Car batteries have sealed chambers that contain volatile chemicals. Under certain conditions, these chemicals can leak gas and bring about a dangerous explosion.Gas EmissionThe sealed chambers inside a battery contain sulfuric acid. When charged, the acid emits hydrogen gas, which is highly flammable and explosive when present in concentrated amounts.VentilationBatteries have safety vents that normally allow hydrogen gas to escape into the surrounding air.IgnitionIf ventilation is poor or blocked altogether, hydrogen gas can collect and concentrate. A spark given off by a jumper cable, a match or by electrostatic action can ignite the hydrogen gas, causing an explosion.HazardsAn explosion can damage the battery’s hardened plastic case, allowing acid to escape, spray the area and burn anything it touches.PrecautionsTake care when jump-starting a car. Do not allow the cables to scrape or drag across metal surfaces or the ground.
