Why is my battery getting fat

[Android Central Question]

I don't know why my battery is getting Fat. it charges super fast and runs out of battery in about 5 second's. it's a samsung galaxy S4 if anyone could help please help

 

[hallux]

Are you saying the back is bulging? You have a swelling battery, the device should be powered off, not charged anymore and taken to a repair facility ASAP.

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[Rukbat]

If it's an S4, remove the battery and get a new one. (It's shot - and it may burst while it's in the phone, leaving you with a big repair bill.)