Solid-State Battery Hits 381 Wh/kg, Charges in 8 Minutes

A new solid-state battery cell has reached an energy density of 381 Wh/kg, a figure that stands well above the typical range of today’s lithium-ion packs. According to InsideEVs, the same cell can also recharge in roughly eight minutes, a combination that addresses both range anxiety and long charging stops.

Higher energy density means more stored energy for the same weight, which can translate into lighter battery packs or longer driving range for electric vehicles. The quick charging claim is equally significant, since solid-state designs are often presented as a way to cut charging times without the thermal risks associated with liquid electrolytes.

The numbers remain laboratory or early-stage results rather than a production-ready product, and questions about cycle life, manufacturing cost, and scaling to full vehicle packs are still open. Even so, the reported performance adds momentum to the solid-state race, where several companies are competing to bring the technology from the lab to the road.