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Right? How long have lithium batteries been around for? We still widely use NiCd/NiMH rechargable and even non-rechargable batteries. Heck, even lead-acid batteries—invented in 1860—are still used everywhere. Lithium will long be needed for storage tech.
This is going to turn into an albatross once sodium-ion technology takes off. >

Retooling and developing battery tech for that will take a decade anyway. Might as well make hay while the sun is shining.