Focusing on batteries is thinking too long-term IMO. If you have 50% renewables or less in the grid, you basically don't need batteries yet, and our deadline isn't time here but greenhouse gases emitted - getting to 50% renewables will give us more time to tackle the rest of our emissions. I expect nuclear to easily beat solar/wind+batteries for the last 10% of the grid, but frankly the last 10% of the grid almost doesn't matter - if we've reduce our emissions by 90%, then we have 10x the time to tackle the rest.
Of course, I've been wildly conflating electricity with all emissions, but I think the low-hanging fruit argument still applies.
Of course, I've been wildly conflating electricity with all emissions, but I think the low-hanging fruit argument still applies.