• Donut Lab’s solid-state battery hits 80% charge in 4.5 minutes, beating ‘scam’ claims Donut Lab commissioned VTT to validate its bold solid-state claims, and the results show near-full capacity retention even after ultra-fast charging. • After weeks of skepticism and even industry figures calling its solid-state battery claims a “scam”, Finland-based Donut Lab has released independent test results backing up its promise of ultra-fast charging. • The startup, which faced sharp criticism from battery industry experts for asserting it had developed a production-ready battery, commissioned the VTT Technical Research Centre of Finland to independently test the cell’s charging speed and thermal behavior. • In the wake of heavy scrutiny, including public comments from major players calling the technology technically impossible, Donut Lab says the results confirm its battery charges rapidly even under extreme conditions. • Rapid charging under test VTT Technical Research Centre ran the tests in what engineers described as a worst-case scenario. • The lab did not use active temperature controls.
Article Summaries:
- Finland‑based Donut Lab has published independent test results from the VTT Technical Research Centre that confirm its solid‑state battery can reach 80 % state of charge in 4.5 minutes at an 11C rate, and full charge in just over seven minutes. The tests were run without active cooling or external pressure, using only passive aluminum plates, and the cell retained 98.4 %-99.6 % of its energy after rapid charging. These findings counter earlier industry criticism that the company’s claims were “impossible” and suggest the design could simplify electric‑vehicle battery packs by eliminating complex cooling systems. The results provide early evidence that the technology could scale beyond single cells.
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