Ever gone looking for an old phone, only to find the frame swollen and deformed, the screen pushed out from the frame, or the display covered in discolored patches? You've likely fallen victim to an expanding battery.
Phones generally use Lithium-Ion or Lithium-Polymer batteries, which can inflate if damaged or overcharged. This causes a surplus of current in the battery cells, causing a buildup of heat and gasses which can be toxic, flammable, or explosive if the battery is ruptured.
