Struth I follow battery development pretty closely and every couple of months there is word of a new battery that can charge quickly and can run for hundreds of miles on a single charge and I would say that most of the experimental units produced can, if factored up, produce, in theory what is suggested. However making a small battery and scaling up to produce them in the millions required are two completely different things.
When you consider where we were two or three years ago to where we are now, its night and day. I firmly believe in the next few years we will be in the same position with massive improvement in cheap readily available batteries that charge quickly and will give 400-500 miles on a charge.