"The buses are equipped with a modular capacity of up to 790 kWh"  This caught my attention in the linked article.  If nothing else it shows what is going on in large format batterier in 2018-19 in Europe.  Modular.........

https://www.pressebox.de/pressemitteilung/bmz-batterien-montage-zentrum-gmbh/BMZ-Group-und-Eurabus-setzen-Meilenstein-in-der-E-Bus-Industrie/boxid/880284