• Donut Lab Donut Lab’s ‘miracle’ solid-state battery confirms 0-80% charge in 4.5 min - but there’s a catch Donut Lab has released the first independent test results for its controversial solid-state battery, and the data confirms at least one headline claim: the cell charged from 0 to 80% in just 4.5 minutes at an extreme 11C rate. • It doesn’t blow up, but it gets pretty damn hot. • The results come from Finland’s state-owned VTT Technical Research Centre, one of Europe’s leading research organizations. • But the report only covers charging performance - leaving Donut Lab’s most extraordinary claims completely unverified. • The VTT test results The VTT report (VTT-CR-00092-26) tested a single 26 Ah Donut Lab cell using a PEC ACT0550 battery tester in a climate-controlled chamber. • The cell was charged at two rates: 5C (130A) and 11C (286A), using a constant-current/constant-voltage protocol up to 4.3V.
Article Summaries:
- Donut Lab’s solid‑state battery has been independently tested by Finland’s VTT Technical Research Centre, confirming the company’s headline claim that a single 26 Ah cell can reach 80 % state of charge in 4.5 minutes at an extreme 11C rate. The test showed surface temperatures rising to 63 °C with two heat sinks, but a single‑sink configuration hit the 90 °C safety cutoff, requiring cooling and tighter thermal contact. While the fast‑charging performance is impressive, VTT’s report covered only this aspect; the battery’s other bold claims-400 Wh/kg energy density, 100,000‑cycle life, extreme temperature tolerance, and cost parity-remain unverified by independent testing.
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