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Well, because they probably never will.

Phones and laptops are weight/volume sensitive, and sodium ions are a lot larger than lithium ions, thus the battery energy density is lower.

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Increased usage of Sodium batteries for static applications (home storage) could reduce demand for Li based batteries. This could reduce the cost of Laptop batteries.

More likely to do the opposite as economies of scale decrease for lithium - though rapidly advancing battery technology and scale in general means I'd be shocked if it ever managed to do the opposite enough to increase prices and not just slow the decline in prices.

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