I use a Hyperion EOS0615i duo3+ to charge my nine 6s 5ah Turnigy lipos in a little over 2 hours. It's powered by two server power supplies in a series. The charger puts out 600W charging at 15A.
A big Hyperion charger might be a good choice for you because you could use it for both your scooter and RC needs.
If anyone's interested, here's link to my thread with some kill-a-watt & Hyperion charger data/pics -
http://endless-sphere.com/forums/vie...26364&start=30