The safety risks associated with lithium battery fires are often a cause for concern. To address this, scientists have proposed a method to provide early warnings of battery fires using sound. The study discovered that lithium-ion batteries undergo a series of chemical reactions before catching fire, leading to a gradual increase in internal pressure and ultimately causing the battery to swell. Due to the hard casing of the batteries, which cannot accommodate this swelling, the safety valve inside the battery bursts when the pressure becomes too high, creating a distinct sound.