Overview
- In VTT’s second test series, the customer‑provided pouch cell reached about 110.5% of its 20°C reference capacity at 80°C and 107.1% at 100°C under Donut Lab’s protocol.
- After a 100°C discharge the pouch lost its vacuum, yet electrochemical function was reported intact and the cell recharged normally.
- VTT described the sample as identified by the customer as a solid‑state cell and explicitly did not confirm the underlying chemistry.
- The measurements were conducted to a procedure defined by Donut Lab and were publicized through the company’s ‘I Donut Believe’ campaign and weekly videos.
- Independent specialists, including Joachim Sann and Ryan Inis Hughes, questioned the lithium‑free claim and urged open, peer‑reviewed tests with direct chemistry verification.