Hi,
You`re not alone 🙂
I have same problem. Battery expanded pushing keyboard up so laptop can`t be closed.
I removed battery and it`s working on power adapter just fine. One problem with that solution – without weight in bottom half it tilts and swings without hands on the keyboard.
I suspect battery puffed cause mine (like yours) is constantly connected to the power adapter.
There are plenty batteries on ali (ca.50$ with shippping), but also there are batteries that are supposedly 4500mAh (oryg.3500mAh).
This larger batteries dont have mounts to screw it inside. I didnt find any opinions about them (are they really working longer?).
I guess I`ll try it anyway.
You should definitely remove your battery (if you didn`t do this already). Puffed batteries can be unpredictable.
Cheers