Donut Lab solid-state battery retains 97.7% charge after 10 days in third test

Electrek
By Fred LambertMar 9, 2026, 10:12 am91 ptsTrending
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. The new report (VTT-CR-00125-26) adds self-discharge performance to the growing…

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