but amount of charge discharge cycles is roughly half what lithium batteries can do This is not true if you are talking about lithium ion batteries. It may be

but amount of charge discharge cycles is roughly half what lithium batteries can do This is not true if you are talking about lithium ion batteries. It may be true for some chemistries if you are talking about lithium iron phosphate. https://en.wikipedia.org/wiki/Sodium-ion_battery#Comparison https://en.wikipedia.org/wiki/Sodium-ion_battery#Comparison