Greater Bay Technology (GBT), a battery startup backed by China's GAC Group, moved its first A-sample all-solid-state battery cells into production this week. The cells contain no liquid electrolyte and passed needle penetration, extrusion, and thermal shock tests without catching fire. GBT is targeting GWh-scale mass production and in-vehicle deployment in 2026.
The technology uses an organic-inorganic composite electrolyte system that GBT says resolves the two most persistent solid-state barriers: electrochemical stability and fast charging. The cells support 2-3C fast charging with minimal cycle-life degradation, a combination that previous solid-state chemistries have struggled to achieve simultaneously. Single-cell energy density is quoted at 260-500 Wh/kg.
That range deserves closer reading. The low end, 260 Wh/kg, is achievable with advanced lithium-ion cells that already exist in production vehicles. The high end, 500 Wh/kg, would be among the highest ever demonstrated in a production-ready form. Where GBT's volume cells land within that range matters more than the headline number.
GBT is a spinout from GAC Group's in-house battery research, with 50+ filed patents covering electrolyte materials, cell manufacturing processes, and the full production chain. China's National Development and Reform Commission (NDRC) has reviewed and is supporting the technology. The parent GAC completed its first all-solid-state battery production line in November 2025 and targets mass production between 2027 and 2030, with declared energy density above 400 Wh/kg and a CLTC driving range of over 1,000 km (621 miles).
The timeline gap between GBT's 2026 in-vehicle claim and GAC's 2027-2030 window is worth noting: startup timelines reflect milestones, corporate timelines account for validation cycles, supply chain, and warranty commitments. GBT is not alone in this race — CATL, BYD, Toyota, Volkswagen via QuantumScape, Mercedes-Benz, and Factorial Energy are all pursuing solid-state at varying stages. GBT's distinction, if it holds, is being the first to move A-sample cells off the lab bench and into a production line.