Upload & Sell: Off
"The battery of the future"-- has been just 5 to 10 years out...
... for the last 50 years.
Advances in the actual, real, functioning world has been evolutionary. The pure and just beyond pure research is fascinating and hopeful-- but I'll hold my breath for that entering the marketplace.... for when that enters the marketplace.
Exactly, but significant improvements do occur occasionally. There must be a balance between density, specific power, cost, longevity and safety among other parameters. I don't see super/ultracaps as replacing batteries for the most part, but of course their usage is proliferating rapidly.