They could, but there is also a cost to separating the batteries. More cables, which means more resistance, which means inefficiency. Not to mention the extra d

They could, but there is also a cost to separating the batteries. More cables, which means more resistance, which means inefficiency. Not to mention the extra design and manufacturing costs. In practice, I don't think any company is meaningfully splitting up their battery pack to take advantage of "better" packaging logistics elsewhere in the frame/body. I know in this example, they could still likely be loosely attached in the same plane, but with less density under the cabin, but I think my point holds.