Yes, you are right, I guess charging batteries in seconds is possible with any battery technology if they are assembled from a very large number of very small c

Yes, you are right, I guess charging batteries in seconds is possible with any battery technology if they are assembled from a very large number of very small cells. This induces a cabling problem. The weight and cost of copper could become very large except if they are very high voltage batteries which means high electronics cost. Somehow fuel cells are a much better idea than electrical batteries for fast "charging", in addition, they offer a clean and efficient way to generate electricity possibly by absorbing CO2.