Do battery replacement can fix my phone?

Helo,

My samsung Galaxy s8plus fell into water and some water gets inside so i turn it off and puts it in rice for 1 week (used hairdryer ).. now i cannot see any water externally. so i decided to turn it on.. i plugged into charger and charged till 40% and swith on . After 10 min the display started to glitch suddenly i turned it off.. then i found the battery has bulged a bit. I tried to turn it on again after some hours but the battery is 0%..Does Battery replacement can fix my phone? Or waste of money. I don't know what to do. Plz help

Thanku