Question

Why mobile battery swells ?

Answer 1

of u are watching something on mobile with the charger inserted in it then there is a danger in swelling of battery.

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Answer 2

There's also no single cause
for a swollen battery. Some are due to
manufacturing defects, others are caused by
the age of the battery, and still other cases
can be caused by misuse, such as not
properly exercising the battery over time, or
by using the wrong power charger.