http://www.dailymotion.com/video/xloamh_high-tech-electric-motorbike-to-debut-in-vietnam_news

This described a self-proclaimed electric scooter motor supposedly "as powerful as a 600cc motorbike engine"

What kind of range are you going to be able to get out of the space you have on a motorcycle to stuff batteries?

And, it'll handle like a harley with all that weight.

Well, the electric "motor" is tiny. It looks like its just part of the rear wheel.
So then you have all the weight that USED to be taken up by the combustion engine, and exaust, (and carbs, etc) to use for batteries.
Should come out about equivalent.