Donut Lab solid-state battery: 5 independent tests in, still no energy density or cycle life data

Electrek
By Fred LambertMar 23, 2026, 10:01 am105 pts
Donut Lab has now released five independent test reports from Finland’s VTT Technical Research Centre on its solid-state battery — and not a single one addresses the two claims that actually matter: the 400 Wh/kg energy density and the 100,000-cycle life. The Q1 2026 deadline that Donut Lab set for…

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