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Battery confirmed as conventional lithium-ion by June 2026 investigation; Finnish financial regulators and criminal authorities launched formal probe; company stated it 'stands by the information previously provided'
A June 2026 investigation backed by more than 20 independent battery experts concluded that Donut Lab's claimed solid-state battery is a conventional lithium-ion cell. Voltage curves at 3.7–3.8V at 50% state of charge and graphite anode expansion signatures matched NMC lithium-ion chemistry — not the sodium-ion solid-state design Donut Lab announced at CES.
Updated Aug 1
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