. My battery cycle is 29, health is 95% and[..]
This is likely why yours is swollen.
Mine also had a ridiculously low battery-cycle (maybe around 35) as I've been mostly using it in a dock, even though I planned on not doing that with the MBP2018 (cause I lost a 2013 one bc of this) it just so happens that I did after all.
Suppose this is why macOS 10.15.5 will bring the battery health feature.
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