For Apple Powder, the iPhone 3GS released in 2009 is a very classic model. At that time, it had extremely powerful hardware specifications. So far, many users are still using this phone. On March 10th, a netizen posted that an iPhone 3GS mobile phone had not been used for a long time, but the battery inside the mobile phone began to expand, and finally broke the mobile phone panel, screen and motherboard. (The following figure)


It is obvious in the figure that the battery has expanded.


Expanded battery

According to netizens, this is due to lithium ion polymer batteries, overcharging (greater than 4.2V) or over-discharge (less than 3.0V), short circuit can cause this phenomenon (commonly known as 'swelling belly'). The mobile phone circuit has a charge and discharge protection board, but the protection board is not a panacea. After the belly is swollen, the lithium battery should be wrapped in a fireproof bag and delivered to a special lithium battery recycling point. It is not possible to puncture a sharp object, and the result of the puncture is that it immediately burns and emits a lot of bad smoke. This battery will not explode.

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