DEAD High Quality Metabo DRILL BATTERY – Can it be REPAIRED?

This is my own personal cordless drill. It is high quality and made in Germany, but unfortunately one of the battery packs have failed.
Are they fixable? Why has it failed? Let's find out

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Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things. I do love fault finding and trying to fix broken things, so I hope that comes across in this 'Trying to FIX' series. Many thanks, Vince.