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> It doesn't mention any real advantages of sodium ion batteries?

Price, ubiquity (no need to rely on a limited number of lithium providers) and lifecycle length (number of discharge cycles).

> Lithium is more rare than Sodium but that should be a minor disadvantage?

Rarer means more expensive.

Not all batteries need to live in a cell phone. If you're building battery warehouses for renewable-gap-filling-in-the-grid, then the weight is nearly a nonissue, and energy density is less a concern.

Price isn't a real advantage?