The thing I usually see about "Great New Battery" is a sales pitch. They don't provide any negative information about the device, and that USUALLY is present, we just don't know it without delving into it further. I've mentioned before how I was part of a rather large "biodegradable polymer" effort when I was working, interesting stuff, and they ALL have one or more key critical issues that means they won't solve whatever problem they are expected to solve in the real world. There were a number of promising candidates hyped out the wazzo, and basically 25 years later, nothing has caught on beyond isolated specialty feel good applications, and in most of those they might as well use regular plastic.
