Um... yes... it would take enormous power to charge the batteries in 5 minutes. A similar thing happens when you fill your gas tank at the pump. It's amazing how long you can drive on that tank, considering how quickly it is filled.

However, if you read more about these particular batteries on other sites, yet, it is possible to charge it in 5 minutes. That sort of system would probably require a secondary capacitor that would build a charge over several hours, and this charge could then be transferred to the car's capacitor in a short amount of time. It's more likely in the short term that a user would plug into their home electrical 110V system, and that the charge would take several hours to charge the capacitor directly (yeah, you need some transformers in there somewhere to get the high voltage you need to charge the capacitor, and the current would therefore be very small during the charge, and it would take longer than 5 minutes). There is nothing here that is physically impossible, however.