Lithium on paper has better energy density because of where the element sits on the periodic table. Sodium is pretty close though. So, it's unlikely to push lit

Lithium on paper has better energy density because of where the element sits on the periodic table. Sodium is pretty close though. So, it's unlikely to push lithium out of the market for a lot of use cases. Both chemistries are likely to continue to improve. And sodium ion is still pretty new. There might be some solid state batteries based on sodium ion at some point. Lithium ion solid state batteries are much closer to market ready (multiple manufacturers have announced product roll outs over the next few years). For a lot of use cases, cost and safety might be more important than energy density. There are a lot of different chemistries at this point. This device is a bit on the heavy side but not overly so. 350 grams is not that heavy. Probably price and longevity are more decisive factors for people that would buy this. And the safety is a nice bonus.