What are the reasons for the swelling of the Apple mobile phone battery?

　　1. The built-in protection circuit of the iPhone battery is defective or the battery has no protection battery. Some consumers buy cheap non-original batteries on the market when replacing batteries. These batteries often cut corners in order to maximize their profits. The battery protection circuit is prone to problems, which eventually causes the battery core to swell and explode when it swells to a certain extent.

　　2. Poor charger performance. It is the most common phenomenon that chargers cause battery problems in Apple mobile phones. Consumers charge the battery with the charger at hand. The battery used may be a cheap charger without a protection circuit system; or it may be a household tablet charger with high current and long-term use, which will cause the battery to swell. There are also some consumers who like to play with their mobile phones while charging, which causes the battery temperature to rise, coupled with the side effects of the electrolyte caused by continuous floating charging, which seriously affects the service life of the battery and eventually causes the battery to swell.

　　3. The phone is not used for a long time. If the mobile phone is not used for a long time, the battery of the Apple mobile phone will swell. If the battery is left for a long time, the voltage drops below 2V, and the chemical reaction inside the battery generates gas, which causes the battery to swell.