- Worldwide Li-ion battery production per year: 35GWh
- Worldwide grid capacity: 5000GWs
- Lifetime of a specific cell in a grid scale battery: 20-30 years
- Current known reserves of Lithium worldwide at current usage rates: 80 years
So even if we magically mined all known Li reserves this year, it still would only be about 14% of the grid for 1 hour or about 9 minutes total for the entire grid. You don't actually need to backup the entire grid (only about 20-30% of it), but you need to do it for at least 4 hours. Basically, it isn't even close even if we only used Lithium for this use. You can get more with Na-ion, but if you think NPPs are dangerous (they aren't)...let's just say nobody would ever insure a grid scale Na-ion battery. Just one leak and it goes up with 1000s of tonnes of TNT of explosive force.