Nifty. At first I thought you were talking about molten sodium batteries, which have been around for a while but inconveniently have to be kept at high tempera

Nifty. At first I thought you were talking about molten sodium batteries, which have been around for a while but inconveniently have to be kept at high temperatures to keep the sodium liquid and so haven't seen much adoption. But yeah, sodium ion batteries are now a thing and don't have that limitation.