Northern Tool sells a li ion batterty hybrid scooter. I can't find any information about the company (Universal Products) on any website. The concept seems good; if the battery begins to wear down just use the 50cc gas motor. Has anyone ever seen or have any information about this scooter? See the link to the scooter below.
http://www.northerntool.com/shop/tools/product_200380038_200380038
Google is your friend, use it!
http://tinyurl.com/yzd7d3g
Many makes and models of hybrid scooters to choose from.