I wouldn't continue to use it. I checked some of my old phones last year and many had developed swelling and I got rid of them. Didn't want to chance a fire.
I still have a couple LG Fiestas from the Simple Mobile 9.99 sale back in 2018, also picked up a Huawei Sensa for $20. The Sensa was really impressive.
There's a replacement battery kit on Amazon if you want to give it a try:
https://www.amazon.com/TracFone-Fies.../dp/B081QF38J5
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