IMHO where I think that new TESLA Battery plant in Nevada will be going with their research...

This specialized cathode enables the aluminum-ion battery to charge and discharge at unprecedented rates. Researchers tested discharging and charging the battery at rates corresponding to a full charge or discharge in less than one minute. They found the battery could charge within a minute and then discharge over periods ranging from 48 seconds to 1.5 hours without suffering major capacity or efficiency losses.

http://blogs.scientificamerican.com/plugged-i...n-battery/

Regards

Sunny:> ))