As someone who is in the automotive industry and has a good understanding of how charging systems on combustion engines work, why can the tesla not have its own internal charging system. It says on the site that for every hour the car charges, it can drive 62 miles, so I'm proposing that the car be designed with an alternator type charging system and TWO batteries each capable of going say 75 miles on a full charge. While the car is on the road it only needs to use one battery for the first 75 miles, and when that first battery depletes, the car can automatically switch the the second battery while the alternator starts charging the first. The car could then run endlessly with no need to stop and plug in... Unless I'm a moron who has no clue as to how the batteries and charging system in these cars work. Please tell me why this doesnt work.