Ipad bent

“Healthy” iPads and iPhones, normally, cannot be overcharged; the charging electronics should regulate the charging process.

However, if a battery or its charging electronics develop a fault, causing the battery to heat beyond a certain critical point, the battery can enter a thermal-runaway state. During thermal runaway, the battery can become very hot and/or physically swell. In addition to heat damage, the battery can mechanically deform both itself and the casing into which it is fitted.

Higher wattage power supplies have the capacity to deliver more power into the iDevice to which it is connected. When all is well, power is correctly regulated to optimally charge the battery. In a fault condition, the increased power capacity of the power supply can cause more power to be disipated by the battery and charging electronics - increasing the likely damage.

Any Lithium-chemistry battery that has been overheated by thermal runaway has been seriously damaged - and for safety must be changed.