Lithium is very abundant. It's the 25th most abundant element at about 20 mg per kg in the Earth's crust. It is present in seawater at a concentration of about 0.2 ppm in seawater, about 230 billion tons total.

If electricity is going to be so cheap then we can just extract lithium from seawater.

Plus dead lithium batteries can of course be used as a high grade ore.

See https://en.wikipedia.org/wiki/Lithium