Donut Labs claims to have built the world's first full all-solid-state battery ready for production, boasting unprecedented energy density (400Wh/kg), 100,000 cycle life, and five-minute fast charging. However, skepticism abounds after the Finnish startup's initial CES 2026 announcement, with industry experts labeling the technology a potential scam. VTT Finland, a government research body, tested cells provided by Donut but found no validation for core claims like the clay-like design freedom or the -30°C to 100°C operating range. The company's response, including a website (IDonutBelieve.com) promising weekly evidence drops and an April Fools' video, has only fueled further scrutiny.

Verge Motorcycles, Donut's parent company, announced the TS Pro EV with the battery will ship in Q1 2026, but the lack of verifiable proof continues to cast doubt on whether Donut's revolutionary battery is real or another ambitious, unproven claim.