Eletric flight is nothing for heavy airliners. Batteries are to heavy and will remain so. The only power source would be nuclear power. But this has acceptance problems.
The smart thing with Alice is: They do what is possible today. Existing "Tesla" battery, lightweight structure, small, short range. It's not a fantasy like many others are it's build for FAR 23 right away.
It doesn't make sense to go bigger than that with available battery technology.