New battery arrived this evening and it's been replaced already. iFixit tools are really good, it never took me this little to open the MBP. The new battery seems absolutely legit, came half charged at 54% and is lasting a lot. OSX isn't showing the "fix battery" warning anymore. Now the trackpad click is soft, I think it's never been this soft, not even when the computer was brand new. That or my fingers have got so strong by clicking on the old battery for months that now I can drill on wood with my sole finger.