Shanghai China has a system of buses based on Supercapacitors rather than batteries. They can be charged much faster than batteries (even the Nanosafe), but hold less energy (at the current time). It is quite possible that supercaps will be superior to the Nanosafe batteries in this application, as they charge faster, with the ability to do many more charge/discharge cycles. Currently, they have somewhat poor energy/weight ratio compared to Lithium batteries. Their fast recharge time, however allows them to be charged at every, or every other stop without inconveniencing the passengers or driver.

The ideal system, would then be to combine the high capacity of Lithium batteries, with the faster charge and higher cycles of Super Capacitors. Between these two technologies, it would seem that the Nanobus is now practical and feasible.

Over the next few years, with new emphasis on EV and Plug-in Hybrids, that the differences between Super Capacitors and Advanced batteries will likely converge.