@thor Battery in my Unibody MBP swelled, but then not only returned to its normal size, but it still has like 76% of its original capacity, despite its age 🤷
I had a battery swell once in a plastic MacBook, they were removable at the time — so that is what I did. When I got back to it a couple of days later it was back to it's normal size. If I didn't have a photo of it VERY noticeably deformed, I'd think that I've made that up.
I don't know how all this works 🤪