Why? That's what these are being compared to in pretty much every other situation. It's a car. It's powered by something different, but it's still a car. Is it more or less safe than other cars?
Are you really saying that if this is less safe than a Nissan Leaf (one specific car that's not in the same car class) it should be forced to change its design to raise the batteries higher -- raising the center of gravity and affecting handling -- even if it is as safe as or more safe than similar gasoline-powered cars in its class?
If that's the situation, should we force one specific gasoline-powered luxury sedan to change its design if its less safe than a specific gas car in another class?