I am using samsung f14 5g for more than 2 years. I was facing heating and slightly quicker battery drain issue. Now I noticed the swolleb battery. There is visible bump on the back of the phone and there is small crack line visible like battery going to burst the back of the phone.
But if the repair cost is more than 50% the original cost of phone, then it's better you buy a new phone as the cost to replace the bulged battery, a bulged frame and screen due to the battery usually go very high.
Sometimes a defective piece comes, which causes such problems like battery bulging, screen issues, etc. Go to the Nearest Samsung Service Center As soon as Possible as it is a fire hazard and may burst into fire at night or when no one is noticing. Mark this response as solution if you found it helpful.
But if the repair cost is more than 50% the original cost of phone, then it's better you buy a new phone as the cost to replace the bulged battery, a bulged frame and screen due to the battery usually go very high.
