My samsung s4 battery has swollen a bit too but i dont know when it did this. It starts with serial AA. It is been used for nearly 2 years though so is this normal?
Im starting to think the issue is the phone overheating causing the battery to swell. Yes the BD serial number batteries swelled more quickly than the other ones so really the fault lies in itself with the phone. Thr s4 has always heated up way too quick so if transferred to any battery will heat up also.
Samsungs replacement battery fix is a cop out. The phones themselves are faulty, overheating.
Im unsure whether i can get this battery replaced as it doesn't match the serial number and is 4 years old by manufacturing date. Do all s4 batteries eventually swell?