• Battery requirement isa function of degree of hybridization • Potential hybrid electric short flight (300 – 400 miles) opportunities for large regional and 150 Passenger single aisle with 400 – 500 Wh/kg specific energy • For hybrid electric large aircraft with battery used during takeoff only, 350 – 400 Wh/kg at pack level required • System analysis needed to identify the opportunity space for hybrid electric large regional and 150- passenger aircraft