AUTO · VERIFIED DEVELOPMENT
Donut Lab Reports 409 Wh/kg Energy Density, Production Claims Unmet
WHY IT MATTERS
The high lab energy density is offset by the lack of production, warning investors and automakers that the technology may still be years away from commercial deployment.
What happened
Donut Lab released an independent test showing its solid‑state battery achieved an energy density of 409 Wh/kg (805 Wh/L). This is the first energy‑density figure the company has published after months of scrutiny.
The result contradicts earlier statements that the cell would be in production and ready to power a production electric vehicle by the end of Q1 2026. The company has not yet brought the cell to market, and the test does not confirm commercial readiness.
The announcement highlights a gap between laboratory performance and the company’s production timeline, raising doubts about its delivery schedule and market viability.
PRIMARY SOURCES
Donut Lab hits 409 Wh/kg in battery lab test, but credibility is gone
Electrek · Fred Lambert · Discovery only; publisher copyright terms apply