Just a completely random thought about the physics of electric, aircraft, isn't the consumption of the weight of fuel and the jettisoning of the depletion products overboard actually the thing that makes any extended flight possible for realistic commercial transport? Batteries don't lose significant weight as they are depleted. In a nutshell, in the current extended range comes from the continuous reduction in weight and thus consumption energy per nm is continuously reducing as the flight proceeds. I don't see how batteries can do this without physically jettisoning them.