The cost of batteries will go a long way to determining how quickly electric vehicles catch on. And the big question is whether we’ll need sweeping chemical breakthroughs to get us there, or whether baby steps can do the trick.
Not just cost, but weight.
And not just cars, but everything else we use (and bitch about), namely: your phone. Wireless charging is fun! Bullshit. What if your phone lasted for weeks and it didn't matter if you plugged it in?
Whomever drives the next battery revolution (pun intended...you're welcome) makes the big bucks.