Electrified Xtracycles

I'm the member who rides a BionX Xtracycle.
Just wondering how many have Xtracycles... and how many batteries are able to fit on the frame. The maximum load on the frame is 50lb on the sides and 100lb on the deck. Seems to me a bike could travel 3-4 hrs, 20 mph, with 100lb LiFePO4 pack.
Man, just thinking about that much time on the saddle makes me ache.