I have one of these:
http://electricscootersworld.com/Xtr...60byXtreme.php
It is a poorly made POS.
It came here for free, because it was broken, the folks that owned it had it repaired once, and got hosed (new: motor, controller, batteries, and throttle). The "repair" lasted 2 weeks when the 200w controller the repair shop installed burnt out. I sourced a controller from the US, and fixed it, but it was hardly worth it.