Donut Lab has released results from a test conducted by the VTT Technical Research Centre in Finland, showing its DL6 battery cell achieved an energy density of 409.3 Wh/kg and 804.7 Wh/L. The measurement was performed on a single cell discharged across a 2.3–4.25V range at a 0.1C rate at 25°C.
The company previously claimed at CES in January that its solid-state battery was ready for OEM vehicle manufacturing and would power Verge Motorcycles by the end of Q1 2026. As of September, no production electric vehicle equipped with this technology has reached the market.
The tested DL6 cell is described as an energy-optimized variant of the V1 cell, differing from previous versions tested by the company. Donut Lab has utilized multiple cell iterations in its testing history, including a V1 unit and a separate next-generation cell examined by Intertek.
While Donut Lab asserts that its bipolar internal structure confirms the use of a solid electrolyte, the VTT report makes no determination regarding the battery's chemistry. The 409 Wh/kg figure is comparable to existing high-end lithium-ion cells, and the company has yet to provide data on its claimed 100,000-cycle design life.