Making batteries from inexpensive and widely available materials is of particular interest for EV makers who are looking to reduce their production costs. This new energy storage could also contribute to the clean energy transition.https://www.notebookcheck.net/New-long-lasting-NaS-battery-is-made-with-lavender-oil.952637.0.html
I am assuming that 500 wh/kg is the theoretical max capacity. Because it would be "crazy good" and not just "impressive".