Li-ION GoPed

http://www.autobloggreen.com/2008/10/02/go-ped-goes-farther-with-lithium-ion-battery-option/

The ESR-750 has traditionally been a lead-acid affair. However they now have a Lithium-ION version.

http://www.goped.com/products/ESR750HoverLI-Ion/Default.asp

Motor 24V Brush D/C with Aluminum heat sink
* Maximum Speed 20 mph (turbo mode)
Dual Performance: Turbo and Economy Modes
Batteries 16, 24 or 36 AH Li-Ion battery packs
Power Controller Advanced Computerized and programmable Variable Speed Controller
Charger On board smart charger 110v-240v capability and External charger
* Range
Range (Econo)* Range (Turbo)*
16 ah 14 Miles 8 Miles
24 ah 21 Miles 12 Miles
36 ah 28 Miles 16 Miles

Unmatched Hill Climbing ability
Transmission Chain Drive
Dimensions Not Folded: L-48" W-18" H-41" / Folded: L-48" W-18" H-17"
Weight
ESR750 Lion 16 Ah W/ 2 Lithium Ion Packs 40 lbs
ESR750 Lion 24 Ah W/ 3 Lithium Ion Packs 43 lbs
ESR750 Lion 32 Ah W/ 4 Lithium Ion Packs 46 lbs

http://www.youtube.com/watch?v=l-NRLfzXgP4