> lithium nano phosphate cells can be charged in 5 minutes 
> (A123
> specifically) if your charging circuitry is well done. 
> More likely a 15
> minute charge would be a "fast charge". The biggest 
> difficulty would be
> getting enough energy to the service station. Service 
> stations instead
> of big tanks underground are going to wind up needing big 
> ultra
> capacitors or flywheels underground to smooth the load.

Old tech :-)

Vanadium redox cells are one possible path. Energy stored in 
vanadium oxidation states in a liquid in tanks and cycled 
through the battery proper as required.

"Roger in Bangkok" may wish to comment on this. Gargoyle 
can.


        Russell


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