Manufacturing defect : A defect in manufacturing is the primary reason why phones explode. The Lithium-ion battery that powers the handset needs to be properly tested before it’s shipped. A wrong component or a fault in the assembly line can cause the battery to malfunction and, in turn, explode.
Physical damage to the battery : The second reason why the phone explodes is the physical condition of the battery. At times when a phone is dropped, it can cause damage to the battery. This can alter the internal mechanical or chemical structure of the battery – leading to short-circuit, overheating, and more.
Using third-party chargers : Third-party chargers more often than not lack the specifications that the handset requires. While they may look the same, the cheap or uncertified chargers can overheat the phone, damage the internal components, and lead to “bubbles” or shorts in your phone’s battery.
Battery coming in contact with water : A battery bursting due to water was prevalent when the handsets weren’t waterproof.
Phone left in the car, in direct sunlight : Too much heat can ruin the phone’s battery. The cells become a bit unstable, lose exothermic breakdown, and produce gases like oxygen and carbon dioxide. These gases can cause the battery to swell, compromise its structure, and eventually, explode.
Processor overload : The processor can also contribute to your phone naturally heating up. The chipset, even the most powerful one, has thermal issues during multi-tasking and running apps with heavy graphics such as PUBG.