Why? Because what your are proposing is a variation of that. And if what you are proposing worked, then in theory one could design a two battery system in which one battery could both provide energy for the propelling the car and propelling the car would turn a generator that would charge the battery. When the first battery runs our of juice, the batteries switch roles and the second battery is used to propel the car and the first battery is charged. And you are saying that this will extend the miles the car can travel beyond what the first battery alone could do. Therefore you are implying that the machine is creating it's own energy by recharging it's self. If this could work, then in theory, the car could go forever on just one initial battery charge because the motion of the car would always be charging one of the batteries. Just keep switching from one battery to the other and the car goes forever.
Likewise, if one fully charged battery can power a car 200 miles, you can't simply charge a second battery using the motion of the car's wheels and then switch batteries and get 201 or more miles. You cannot make a machine that creates it's own energy from its own motion more than the energy it was supplied from an outside source. When a generator is used to charge a battery, you never get as much energy out of the battery as it took to operate the generator to charge the battery because no machine is 100% efficient.
Great response... Ok a few things, uhhhh if I can be as good at responding as you were. Ok in one of my post I wrote that the miles would be sacrificed because of the added drag on everything due to recharging while in motion, so instead of the EV reaching it's original mileage goal without the added drag, it would only reach instead of 200 miles out it would only reach 140.
But when switched over to the secondary batteries, it would reach 140 again before switching back to the newly charged primaries. Ok, and so we are now saying that the primaries couldn't be recharged with the weaker charging system because we can't create a charging system that would create to much drag, so the primaries would suffer in this regard on being fully charged back up correct ?
Hmmm ok so now we only get an added 100 miles out of the recharged primaries before having to switch back over to the recharged secondaries again, and then we only get 80 miles extra from them because as the miles get lower so does the charge being applied.
Ok now at some point the EV needs to be placed in dock (at a recharging station), in order for primaries and secondaries to be fully charged again. After that the system returns to it's original 200 mile reach on just the primaries until the process is reactivated and used again.
So no charging needed until switch over to the fully charged secondaries that were in waiting, and then the charging system kicks in to start the charge on the primaries that would be switched back over too once the secondaries are lowered to a level that warrant's the switching process to be repeated back to the primaries for let's say the get back home stretch run.
Ok in all of this, did we extend the miles driven on the EV, even though as you say it is a dying process due to the somewhat added drag that is created by the weaker charging process and switching mechanism ?
Ok and then we could still have the regenerated braking process or down hill process that can also be available in the vehicle as another charging method used in the complete recharging on board system.
