Like I've harped on about in countless threads - electric is the future of all transport, especially aviation. But it perhaps makes even more sense for helicopters - rapid startups, no tail rotor coupling, more silent, less cost, high altitude etc etc. List is endless.
I read that the new Sikorsky S-76D has a tag price of $13 million. That's a lot of money for something that's basically designed in 1976. Electric propulsion will be able to bypass all the corporate greed from engine manufacturers charging an arm an a leg for something that isn't that complicated, just because the customer can't go anywhere else. Electric will level the field.
I hope these new Lithium Nickel cells become as good as they sound.