>Dr Zhao’s Na-S battery has been specifically designed to provide a high-performing solution for large renewable energy storage systems, such as electrical grids, while significantly reducing operational costs.

Presumably that means that this is more national infrastructure level than mobile phone level, which will make things like renwable energy more viable. Or at least that is what they are aiming for right now.

Its certainly possible that they could produce something more mobile phone friendly in future and they are going big now because that is the area in most desperate need, I just don't know what the fundamental limits of this technology are, I hope they can go smaller as it woupd be great if we became less dependent on Lithium