In Pictures: Donut Lab's Solid-State EV Battery Passes -30°C Cold-Weather Test, Backed by VTT Reports

Donut Lab claims its solid-state battery packs 400 Wh/kg energy density, a figure the company says is now backed by third-party reports.

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The Finnish startup says its battery supports five-minute charging, a claim it is publishing detailed test data to defend.

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Donut Lab is releasing third-party reports to counter skeptics of its solid-state EV battery technology.

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Independent testing at -30°C follows earlier VTT-validated results at 100°C, according to the company.

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The cold-weather milestone comes as solid-state batteries are pitched as a next step for electric transport.

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Donut Lab says its solid-state cells are designed to perform in extreme conditions without conventional liquid electrolytes.

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VTT validation and independent cold testing are central to Donut Lab's effort to substantiate its performance claims.

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If borne out, five-minute charging and high energy density could reshape EV range and refueling expectations.

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The startup is betting that transparent third-party testing will distinguish its solid-state battery from rivals' promises.

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