Even if we keep looking at only batteries for grid storage instead of all the estabilished and proven ways: the predicted lithium shortage would happen gradually over O(100 years), leading to rising cost of lithium batteries which should give lots of lead time for investment in alternatives, of which we have many, both in old ones (pre-lithium) and many prospective ones under development.

IMO the more alarming problems currently in climate change are the missing plan for global fossils rampdwn and solving the international-relations collective action problem of enacting the required energy saving policies in a coordinated and fair way.