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  "path": "/2026/03/09/donut-lab-solid-state-battery-self-discharge-test-vtt/",
  "publishedAt": "2026-03-09T14:12:00.000Z",
  "site": "https://electrek.co",
  "tags": [
    "News",
    "ev batteries",
    "more…"
  ],
  "textContent": "Donut Lab has released its third independent test report from VTT, the Finnish Technical Research Centre, and it confirms another claim: the solid-state battery retains 97.7% of its charged capacity after sitting idle for 10 days.\n\nThe new report (VTT-CR-00125-26) adds self-discharge performance to the growing list of independently verified specs — but three reports in, the two most extraordinary claims remain completely untested.\n\nmore…",
  "title": "Donut Lab solid-state battery retains 97.7% charge after 10 days in third test"
}