US EditionDonut Lab solid-state battery survives 100°C discharge in second independent test
Independent VTT tests confirm Donut Lab's battery delivers 107.1% capacity at 100°C and 110.5% at 80°C despite pouch vacuum loss, supporting high-temperature claims.
- Last week, VTT Technical Research Centre of Finland released a second independent test showing Donut Lab's Donut Solid State Battery V1 can discharge and gain capacity up to 100°C, and it survived by remaining rechargeable after high heat.
- Donut Lab is publishing weekly VTT tests to counter heavy skepticism after CES 2026, with CEO Marko Lehtimäki pledging Q1 2026 shipping for Verge Motorcycles.
- Using a steel plate and heatsink, the test team observed the cell's capacity increased from 24.9 Ah at 20°C to 27.5 Ah at 80°C and 27.6 Ah at 100°C, with internal resistance falling at higher temperatures, according to VTT research.
- VTT's report leaves headline claims unverified, as 400 Wh/kg energy-density and 100,000-cycle life claims remain untested, and VTT did not test-30°C while noting pouch outgassing at 100°C.
- While major manufacturers target 2027 or later, Donut Lab’s weekly VTT reports and two independent tests in two weeks show transparency, but full proof of heat-tolerant capacity will take considerable time.
11 Articles
11 Articles
Donut Lab’s solid-state battery can handle the (extreme) heat, test says
Finnish startup Donut Lab is out to prove that its solid-state battery is all that it claims to be. Last week, the test was about fast charging. This week is where things get hot. Like the first test, this one was also conducted by state-owned VTT Technical Research Centre of Finland. The team set out to determine how well Donut Lab's cells held up under extreme heat, which has been known to adversely affect traditional lithium-ion batteries. Th…
Donut Lab solid-state battery survives 100°C discharge in second independent test
Donut Lab has released a second set of independent test results for its controversial solid-state battery — this time proving the cell can discharge at extreme temperatures up to 100°C and actually gain capacity in the process. The new VTT report, released just one week after the first test confirmed the cell’s fast-charging capability at 0-80% in 4.5 minutes, adds another data point in favor of Donut Lab’s claims. But the most extraordinary spe…
The data on Donut Labs solid-state battery sound almost too good to be true. Competitors even accused the Finnish startup of fraud. Now the company has presented independent test results for the first time. read more on t3n.de
Further Donut Lab Solid-State Battery Test Shows 110% Capacity at 80C
Donut Lab’s solid-state, lithium-free battery has undergone a second round of independent testing, revealing both promising results and critical gaps. Conducted by Finland’s VTT research center, the evaluation highlighted the battery’s exceptional performance at elevated temperatures, including a capacity increase of 110% at 80°C and sustained functionality even after deliberate damage at 100°C. These findings […] The post Further Donut Lab Soli…
Donut Lab Just Turned Up the Heat on Solid-State Battery Expectations, and the Results are Surprising
Donut Lab, a Finnish company, recently released some impressive test data demonstrating how their solid-state battery handles extreme temperatures that conventional lithium-ion cells would struggle to deal with. The test results come from a series of measurements conducted by the VTT Technical Research Centre of Finland, a respected, government-backed research organization. They needed to figure [...]
Donut Lab's solid-state battery found to perform well at high temperatures
Donut Lab commissioned the VTT Technical Research Centre of Finland to measure the properties of the world’s first solid-state battery ready for production vehicles developed by the company under independent conditions. The test measured the battery’s performance at high temperatures and demonstrated that the Donut Battery can withstand heat extremely well and offers even greater capacity at high temperaturesDonut Lab has published the results o…
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