Chinese researchers have developed a sodium metal battery that fully charges in 4 minutes and maintains its capacity over years of use, addressing two major battery limitations that have blocked sodium alternatives from mainstream adoption. Sodium batteries are cheaper to manufacture than lithium and use more abundant materials, so faster charging without degradation could significantly reshape EV and grid storage economics. The main gap left unclear: whether the four-minute spec applies to full vehicle-scale deployment or lab conditions, and real-world cycle testing data outside the research team's own tests.