How did the story end? I have 5 haibike bosch classic e-bikes and protected myself from such damage by just buying few used or discarded engines (for under 150 USD/piece) I drove 8000 km with one and never got such glitch.
Im returning customer - cells are great and the prices beautiful. I already recelled 3 of my Bosch Classic bateries from 288WH to 500. Everything works fine.