Lithium batteries.
The electrolyte in lithium batteries uses organic substances, which are flammable substances. When the lithium battery is pressed, punctured, high temperature, etc., the SEI (separator) film will rupture, allowing the lithium ions to move disorderly from side to side, instantly releasing huge amounts of heat, and ultimately causing If the battery explodes, lithium batteries also release a large amount of oxygen when they burn, increasing the risk of fire.
The electrolyte in lead-acid batteries is sulfuric acid, which is a substance that does not ignite easily. Lead and sulfuric acid inside lead-acid batteries are relatively stable substances. There is also water and sulfuric acid. inside lead acid batteries, but since most current lead acid batteries uset gel batteries, the moisture content inside the battery is low and the risk of fire and explosion is less likely to occur.