The cell that I tested is not first generation. People keep saying that new versions will fix the voltage range and that's not true. Show me any sodium ion variant that has a flat charge and discharge curve. New versions have better efficiency and cycle life, but there is no change to the wide voltage range. That is here to stay, forever. It's inherent in a chemsitry. And if you add a buck boost converter, you'll decrease the round trip efficiency and increase the cost substantially. You also do not want to use relays or fets to "rewire" packs in parallel or series depending on the soc. So many moving parts and software that can cause problems. And to make a battery with that feature that can be safe long term is a nightmare. And it would increase the pack cost significantly.