Inside Donut Lab’s 400 Wh/kg Solid-State Battery Claims & Missing Test Details

Skepticism grows around Donut Lab’s “impossible” battery as experts debate capacitor-like behavior and scarce independent test data.
Electrek

Donut Lab solid-state battery retains 97.7% charge after 10 days in third test

Donut Lab's third independent VTT test confirms its solid-state battery retains 97.7% capacity after 240 hours idle. Energy density and cycle life remain untested.
IEEE Spectrum on MSN

Donut Lab is on the defensive for its solid-state battery claims

Independent tests of Donut’s battery fail to quell the controversies ...

China's solid-state EV batteries hit the road – here's how far they claim to go

Chinese automakers are planning to start testing solid-state EV batteries in 2026, with one claiming massive energy density ...