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For my line of work (government utilities) I was at a conference this last week. One of the vendors there had a very interesting concept - an energy storage device with the primary component being supercapacitors.

One of the benefits of the supercapacitor is that it replaces the bulky lithium battery that's now the biggest headache for designing EVs. In fact, they have developed a way to print their supercapacitors in many different forms. They are working with Shelby and MacLaren right now to power a "supercar" using sheet-produced supercapacitors that will be molded into the body of the car - resulting in no need for placing a large battery at all.

It's pretty cool stuff, and in theory they could be used to create a motor that looks close to the original A engine, but fully electric.

Of course, it can never replace the sound and feel of a real internal combustion engine, but the technology certainly is impressive.