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The video says it's 175 kwhr per kg compared to 185 for LFP that's already used in some cars. Gold standard is Lion at 300. Volumetric is the same ratios.
So it's usable in cars and absolutely immediately useable in homes.
Sodium batteries generally have poor round-trip efficiency. This won't be game-changer for home or solar use unless CATL can solve that problem.
Google says 80% compared to up to 95% for LifePO4. Extra 15% cost for waste heat during charging vs 10x cheaper battery.