Donut Lab has announced an ambitious battery and VTT has published measurements on specific cells, but those results do not establish that solid-state batteries are in customer-delivered production vehicles. The evidence available through September 2026 includes cell tests and a company-announced motorcycle-pack test—not an independent audit of serial production, deliveries, claimed 100,000-cycle life, or cell chemistry.
What’s up with Donut Lab?
The story is a gap between a bold production claim and what the published tests can show. On January 5, 2026, Donut Lab said its battery was ready for OEM use and that Verge motorcycles using it would be on the road in the first quarter of 2026. CEO Marko Lehtimäki put the timing plainly: “At Donut Lab, our answer on solid state batteries being ready for use in OEM production vehicles is now, today, not later.”
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That was the company’s assertion, not independent confirmation of vehicle deliveries. In a September 2, 2026 report, Electrek said no production EV running the battery was on the road at that time; it described vehicles shown in surfaced internal videos as pre-production units. The sources available here do not include independent customer-delivery records, so the careful conclusion is that Donut Lab’s original production claim was not confirmed by that later reporting.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsWhat did Donut Lab claim, and what has been measured?
Donut Lab’s January announcement claimed 400 Wh/kg energy density, five-minute charging, a design life of up to 100,000 cycles, retention of more than 99% capacity at temperatures below −30°C and above 100°C, and use of abundant, affordable materials. Those remain company claims unless a specific independent measurement below addresses them. The VTT results do not verify the full set.
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| Evidence | What was reported | What it establishes—and does not |
|---|---|---|
| VTT cell charging report, February 9, 2026 | VTT report VTT-CR-00092-26 says the customer supplied energy-storage devices it identified as solid-state cells. For the tested cell, VTT determined a nominal capacity of 26 Ah and tested charging at 5C (130 A) and 11C (286 A) with specified voltage limits and heat-sink arrangements. | Measured charging behavior for a supplied cell under defined laboratory procedures. It is not a manufacturing-scale assessment or proof of vehicle lifetime performance. |
| VTT self-discharge report, March 4, 2026 | VTT report VTT-CR-00125-26 tested cell DL1 after charging it to about 50% state of charge and leaving it idle for 240 hours at 22–28°C. VTT reported that 97.7% of the charged capacity could be discharged afterward. | A result for one cell and one idle-period protocol; it does not demonstrate 100,000-cycle durability. |
| Verge TS Pro pack test announced by Donut Lab, March 16, 2026 | Donut Lab described a test with Verge Motorcycles using an earlier-generation TS Pro and a new model-year 18 kWh pack. The pack began at about 20°C, maintained more than 100 kW for five minutes, and rose from 10% to 50% charge in that time. The companies reported 10–70% in just over nine minutes and 10–80% in 12 minutes. | A company-announced test of an assembled pack in a motorcycle. It is not an independent assessment of serial production, customer use, or long-term pack performance. |
| V1.5 cell energy-density measurement reported September 2, 2026 | Electrek reported that VTT measured Donut Lab V1.5 cell DL6 at 409.3 Wh/kg and 804.7 Wh/L, discharging from 2.3 to 4.25 V at 0.1C and 25°C. The report describes two capacity cycles. | A specific cell’s energy-density result under the stated protocol. Two capacity cycles do not establish the claimed 100,000-cycle life, and energy density alone does not establish electrolyte chemistry. |
Are Donut Lab batteries in production?
There are two different questions hidden in “in production”: whether a company says a product is ready for OEM use, and whether vehicles containing it are being built and delivered to customers. Donut Lab’s January statement addressed the first and also asserted that the battery was already in production vehicles. Electrek’s September report challenged the picture of vehicles on the road by saying no production EV using the battery was then on the road. The tests described above do not resolve that disagreement: cell testing and a pack test are not evidence of serial manufacturing or customer delivery.
Accordingly, the most defensible status is that Donut Lab has made production-readiness claims and demonstrated some battery behavior in tests, while customer-delivered production vehicles were not confirmed by the cited reporting. That distinction matters: a prototype or pre-production vehicle can show that a pack works in a vehicle without proving that a production program has begun or that customers have received vehicles.
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Do the tests prove the battery is solid-state?
No. VTT’s February report describes devices supplied by a customer, which identified them as solid-state cells. That is a record of how the supplied cells were identified, not a reported chemical analysis that independently establishes electrolyte composition. The September energy-density measurement concerns how much energy the tested cell stored per unit of mass and volume; it does not identify whether the electrolyte is solid.
Performance and chemistry are separate questions. A cell can produce a measured charge rate or energy-density result without that result, by itself, proving the structure of its electrolyte. The cited reports therefore support specific performance observations, not a definitive independent finding about the battery’s chemistry.
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What remains unproven?
The measurements are meaningful within their boundaries, but they should not be stretched into broader conclusions. In particular, the available reports do not establish:
- That the tested cells are representative of batteries being made at serial-production scale.
- That the up-to-100,000-cycle design-life claim has been demonstrated; the later report describes only two capacity cycles.
- That the cell chemistry has been independently confirmed as solid-state.
- That a production vehicle using the battery has been delivered to customers.
- That results from a cell or a particular pack test describe safety, durability, or performance across all vehicles and operating conditions.
The useful way to read the Donut Lab story is to keep the unit and the claim attached to each result: a laboratory-tested cell is not a vehicle; a company-announced pack test is not a delivery record; and an energy-density measurement is not a cycle-life or chemistry verdict.
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