Overview
- Finland’s state-owned VTT tested a single 26 Ah (≈94 Wh) Donut Lab cell for charge speed and thermal behavior only.
- At 5C, the cell reached 80% in about 9.5 minutes and delivered 100% of its charged capacity on discharge; at 11C, 0–80% took about 4.5 minutes with roughly 99% capacity retention.
- Peak temperatures included about 63°C at 11C with two heat sinks, while a one-plate setup triggered a 90°C safety cutoff until tighter thermal contact was applied.
- Key assertions remain unverified, including 400 Wh/kg energy density, 100,000-cycle life, chemistry and dendrite behavior, and pack-level performance or manufacturability.
- Donut Lab is publishing results via its “I Donut Believe” site after industry skepticism, and it says more VTT reports and a planned Verge Motorcycles deployment are coming.