E motorcycles are not even in the same planet for weight and size comparison. Also voltage. EV car batteries hold huge amounts of voltage (exponentially more than an electric motorcycle battery) and something as simple as mishandling could lead to deadly results while doing something as routine as swapping out the packs. Plus architecture. Batteries aren’t under the hood; they’re in the floor pan. There are lots of reasons. Formula E racing doesn’t use modular batteries; they swap the driver over to a new car when they pit. If modular batteries were feasible; they’d be doing it already.