After months of investigation, more than 20 independent battery experts have found that the battery technology promoted by Finnish startup Donut Lab is not the breakthrough solid-state sodium-ion battery the company claimed. These findings raise serious questions about a technology that attracted about $25 million from over 1,300 investors and pushed the company’s value up to $1.25 billion.
The report, led by battery researcher Ziroth, looked at electrochemical tests, company records, and interviews with industry experts. All the evidence suggests the widely publicized battery is actually a regular lithium-ion cell rather than the revolutionary chemistry unveiled at CES 2026.
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