lovefromisrael ive now noticed that the battery got bloated
I got bloated battery on my 2013 MacBook Pro every 3 to 4 years because I always left it plugged in. Last year I installed Al Dente which can cap the charge at 70% (very similar to the 80% charging optimization in GOS) so I don't have to worry about the bloated battery anymore.
I also learned that from 80% to 100% is the most damaging phase when charging the battery so need to avoid that as much as possible. Your 15% problem might well be a calibration issue - you need to drain the battery to nearly empty then charge it to 100% in order to calibrate. But that's a moot point now that your battery is already bloated and needs a replacement.