As Rich said, the rated capacity is usually at the 20 Hr rate. At 1C, you can generally halve the advertised capacity. Google "Peukert Effect" if you want to know more.
Most of the EV crowd hang out at Endless Sphere.
I personally have owned an EVT-4000 electric scooter for over a year now, and am building an electric assist push-bike
http://www.endless-sphere.com/forums/viewtopic.php?f=6&t=5191
The scooter will be converted to Lithium batteries later this year.
Amanda