This is a problem a family member had for me. Everytime it was fixed, it just kept swelling up. The problem go so bad, the phone just stopped working all together and got the new s10. You might experience the same. I never had a swelling issue on the s5 I had. I skipped the phones till the s10 came out. I know of friend who had the s6 and the same happened to his where the battery swelled. So, maybe it's just a problem that happens when it's near its life expectancy.
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