I was watching something like 5 gadgets ahead of their time on youtube and I think this might qualify as one, though I'm not sure if they're called gadgets, with the chargers, maybe. But the capacity of batteries has been sort of holy grail of science, not much different from the originals invented about century back. Now if they can increase the capacity, that'll be the day and that will make solar energy more practical. Saving sun energy at daytime, storing 'em for nighttime usage, hmmm, that'll be great...