This one looks interesting and the price is reasonable.
http://cgi.ebay.com/Fast-Charger-Cha...#ht_2419wt_906
The only thing that bugs me is the charging jack on the scooter. It's a three prong thing exactly like the power cord of a computer. There must be one for positive and one for negative but what is the third one for. Opening up the rear fairings and seat of the scooter to see the battery and look at the wiring looks like a tedious job. I'll ask the dealer later this morning as I have to go see them to pick my second battery.