Stonewolf, the solid state. It's interesting right now.
One manu I have been watching, are pulling a tesla on their product's ratings and stated capabilities.
Remember how the powerwall was promised with all this grandoise and then quietly the specs dropped, reduced and went down.
Seeing same thing now with the SS supercaps. Amp ratings are dropping, and cycle life went from an original claim of almost a million cycles, to now maybe 10k or so. Now that these things been on the market for a while and are seeing real genuine use, and real world data is coming in on them, initial claims are quietly being re adjusted to match reality.
With that being said, I don't see any weight reduction really, in fact is heavier. Price might come down over time, but for now is pretty high. The only real benefit right now is no chemicals, or corrosives. The supercaps are essentially cellophane / saran wrap and carbon rolled into a tight tootsie roll with electrodes on it. Besides for safety, there is no real 'gain' in capacity .vs. weight on them for the time being. I havent heard of much in the way of capacity milestones hitting anywhere, just a bit of safety. I don't expect to see anything breath taking coming out in the next 4 or 5 years really. At least not at our level, and THAT is the one thing that is going to have to happen really to make Electric vehicles really hit mainstream. If not capacity, some fast charge that can be done in like 5 or 10 minutes, but THAT is going to take multi megawatts per station if you don't want a line of cars a half mile long.... and THAT is gong to take a major infrastructure overhaul. Were a ways out on all of this no matter how it plays out.
Aaron