The propulsion system is listed as an Independent Hybrid system. Unless they are using the term differently than the rest of the propulsion industry, this means that they have 2 separate drive systems - 1 being the turboprop engine(s) and 1 being the electric motor(s) via batteries - without interconnection. In other words, there is no drive linkage from the turboprop to the electric motors via generator and batteries, so no charging is possible in flight. I do no know why they would choose this system unless there is some sort of safety/reliability concern, or maybe to avoid licensing fees to Toyota, Nissan, or Honda?