Calling them BEVs is misleading and damaging to EVs as a whole, because you’re right, batteries do have their limitations, at least today’s batteries. The proper industry term is FEV, fully electric vehicle. Choosing to limit EVs to only batteries is an arbitrary decision made for argument’s sake, but instead of looking at how they can be improved, you’re just focusing on why it’ll fail. A “battery” is anything that stores energy, not just the traditional battery, and once EVs are the norm, they probably won’t be using LiPos, they’ll be using something that hasn’t been invented yet.
Driving with something that power dense is incredibly dangerous. You’re literally driving a bomb, dynamite is 4.6 MJ/kg