I was typing on my old MacBook Pro today and noticed that the bottom case was wobbling back and forth a little despite being on a flat desk.
I grabbed my trusty iFixit toolkit, took off the case bottom, and found this:



That’s what we call a “spicy pillow”, a lithium-ion battery that has chemically degraded to the point of releasing gas. The only way to fix it is to (carefully) remove the battery and professionally dispose of it because it’s a fire hazard.
Sadly, the battery pack in this model is glued into the case with a strong adhesive. To get it out, I’d have to disassemble pretty much the entire bottom case and then loosen the adhesive with solvent, all the while working around a battery that may turn into a tiny volcano if it’s pierced by a screwdriver or the corner of a spudger by accident. That’s $100 or so for a new battery, plus two or three hours of tricky labor, all to fix a laptop that I bought in 2017. I decided not to spend the time, money, and effort to keep a 9-year-old laptop going, so I pulled out the SSD storage, closed the case again, and set it aside for disposal.
I used that MacBook Pro pretty steadily for the last seven years, so I’d say I got my money’s worth out of it. Still, it has traveled to a lot of places with me, and I wrote more than one novel on it, so I’m a little bummed to have to retire it. It couldn’t run the latest MacOS anymore, but it was still working just fine for daily computing. Alas, it’s not safe to use like this anymore, so out to the great computer lab in the sky it goes.