I never said the battery was 900KG I said the weight penalty was 900KG. ie you lose 900KG of payload capacity. You said it was half.I have read a different Website than you then , one does wonder how you will charge/ or part a 900 Kg battery in a half an hour ,charging points in the States my next door to a power Station so there's no voltage drop !
Charging is done in special superchargers which will need to be installed. Most US and canadian companies buy these use them for point to point distribution between warehouses. Fixed routes so charging infrastructure will be set up.
This is the orders for it so far that are known about.