It's never going to be there. Batteries are wear items. They will inevitably need to be replaced. Which means mining minerals out of the ground while will require machinery that requires some kind of fossil fuel. Then we have to figure out what to do with these batteries when they inevitably hit their end of life. Not to mention that batteries don't really scale very well. That's not even getting into what's going to happen with the constant charge/discarging they'll undergo.

But even assuming we manage to solve all these issues, we'll have to deal with what happens when these "batteries" start catching fire.