A swollen battery is a pretty scary sight. However, when you notice a problem, it's important to cope with panic, understand why it happened, and take a number of important steps to save yourself and your damaged device.
Let's explain how a battery works in simple terms. It has two main components: an anode and a cathode. The anode is usually made of graphite, and the cathode is made of lithium oxide. Between them is an electrolyte that conducts electricity. When your phone's battery is charged, lithium ions move from the cathode to the anode through the electrolyte. When the battery is discharged, the ions move back. This process is repeated over and over again.
Over time, or due to any number of factors, some lithium ions may begin to accumulate on the anode. This can cause the battery to expand in volume because lithium ions take up more space than they would normally use.
Manufacturing defects can also be the cause of battery swelling – here all the blame and responsibility lies with the device assembler.
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