Donut Lab battery charges to 80% in 4.5 min, but big claims remain unproven
Electrek • • business
Key Points:
- Donut Lab's solid-state battery independently tested by Finland’s VTT confirmed ultra-fast charging, reaching 80% state of charge in 4.5 minutes at an 11C rate, though the cell's temperature rose significantly, hitting a 90°C safety cutoff under minimal cooling conditions.
- The VTT report only verifies fast charging performance and does not address Donut Lab’s more extraordinary claims, including 400 Wh/kg energy density, 100,000 cycle life, extreme temperature performance, or cost parity with lithium-ion batteries.
- Industry experts remain skeptical, as Donut Lab’s claims far exceed current solid-state battery benchmarks, and no independent verification exists yet for the most critical metrics; the company plans further VTT testing soon.
