The issue is that Tesla apparently installs the exact same battery in some of its models.....but will manipulate the computer software so that the same battery doesn't perform as well as it should....and then sells the car for apparently tens of thousands of dollars less. Why? It theoretically should take more time to make the battery perform less-than-optimum, but they sell the car with that battery for way less? 
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Think of it this way: In the old days would it make any sense - any sense - for a car manufacturer to install the exact same size engine in their cars.....but then would charge you thousands less if you wanted them to go under the hood and plug up the intake manifold to a couple of cylinders.....so the engine would not work as well as it could?
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We are talking about software manipulation to make the already-installed battery work less efficient.