Complete tangent. The problem is that if the blogger had any idea what he was talking about he wouldn't be coming up with some dumb idea that every purpose built EV has to have flat cells that are placed under the seats. In fact he's so uninformed that he doesn't know that the Tesla uses thousands of cylindrical 18650 cells not large flat format cells, a fact which by his definition makes the Tesla NOT the purpose built EV he claims it is. Egads.
The big differentiation between whether an EV is purpose built is in the exterior design and, more specifically, whether you're primarily concerned about drag or weight. For a traditional ICE design you're concerned about mass, aerodynamics, and rolling resistance. For an EV you're looking at aerodynamics, electrical loads and then mass and rolling resistance. The Volt, the Leaf, and the Model S are all purpose built EVs. Only one uses large format cells placed under the seat but all are built to minimize drag.


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