Solid-State Battery Hits 80% in 4.5 Minutes in Independent Test

Donut Lab’s Bold Solid-State Claims Under the Microscope

At CES 2026, Finnish startup Donut Lab surprised the EV industry by announcing what it described as the first commercially viable solid-state battery capable of ultra-fast charging and long service life. Many experts immediately questioned whether such performance was technically possible. The company has now released results from independent testing conducted by Finland’s VTT Technical Research Centre. The validation focuses on charging performance and represents the first third-party confirmation of Donut Lab’s claims.

Charging remains one of the biggest ownership challenges for electric vehicles. Expanding charging networks have improved convenience, but recharge times still shape buyer confidence and usability. Donut Lab’s battery directly addresses this limitation.

During testing, the solid-state cell sustained an 11C charging rate. The battery reached 80 percent charge in 4.5 minutes and achieved a full charge in just over seven minutes while maintaining nearly full energy capacity after discharge.

The tests also showed that the battery operated without active cooling systems or extreme structural pressure. This simplifies battery pack design compared with many experimental solid-state concepts. Donut Lab previously demonstrated its five-minute charging ambitions, but independent verification strengthens credibility. Key claims such as 400 Wh/kg energy density and a projected 100,000-cycle lifespan still require further independent confirmation.

Fraud Accusations

Industry skepticism remains strong despite the successful charging demonstration. According to a report from Car News China, Yang Hongxin, chairman of Chinese battery manufacturer Svolt Energy, publicly described Donut Lab’s production-ready claims as fraudulent. He argued that the company’s specifications conflict with current technological limits. His comments reflect a broader industry position that fully commercial solid-state batteries are still years from large-scale deployment.

The disagreement comes at a time of intense global competition. China has moved aggressively to define standards for solid-state batteries while investing heavily in research and manufacturing capacity. Japan and other major economies are also funding development programs tied to future EV competitiveness. Control of solid-state battery technology could determine leadership in the next phase of electrification.

Donut Lab’s verified charging performance introduces uncertainty into established timelines. Even partial validation forces established manufacturers to reassess development assumptions. Competitors may accelerate testing programs and commercialization targets. The result is an increasingly competitive environment centered on next-generation battery chemistry.

The Holy Grail Remains Elusive

Toyota continues to target the launch of solid-state battery vehicles later this decade. Company executives, along with leaders at Honda, have warned that expectations surrounding the technology may be exaggerated. Manufacturing complexity, durability validation, and cost scalability remain major engineering challenges. These barriers explain why commercialization timelines have repeatedly shifted across the industry.

Donut Lab’s announcement generated strong reactions because solid-state batteries promise solutions to multiple EV limitations at once. Faster charging, improved safety, and higher energy density remain theoretical advantages. Translating laboratory performance into reliable mass production remains the difficult step. Success in controlled testing does not automatically guarantee performance in complete-vehicle battery packs.

Regardless of the final outcome, the independent charging validation represents a significant moment for the EV industry. Solid-state batteries are no longer distant research projects. Automakers, suppliers, and governments are now competing to commercialize the technology first. The future competitive advantage in electric mobility increasingly depends on battery innovation rather than vehicle hardware alone.

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