EisFrei

Leave the weight as it’s, accept lower range which is offset by faster charging speeds. Or just buy a car with a lithium battery if you cannot accept this.

They indeed have less energy density, but I don’t get your point about less safety. They work better in high and low temperatures, can be charged a lot faster and don’t degrade as fast. Sodium isn’t as reactive as Lithium, lowering the risk of fires.