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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Donut Lab has not yet demonstrated that a five-minute solid-state battery is powering customer vehicles. The company announced a battery with a claimed 400 Wh/kg energy density, a five-minute full charge and a 100,000-cycle life at CES 2026, and said it would be installed in Verge TS Pro and Ultra motorcycles. But the publicly described testing so far is narrower: a commissioned laboratory test charged an individual cell from empty to full in just over seven minutes at a very high rate. It did not validate the headline energy-density or cycle-life claims, and Verge’s current delivery schedule points to Q4 2026 for U.S. and EU TS Pro orders.
What Donut Lab originally promised
Donut Lab’s CES announcement presented its battery as an all-solid-state product ready for immediate OEM production. The headline specifications were:
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| Claim | What Donut Lab said |
|---|---|
| Energy density | 400 Wh/kg |
| Charging | Full charge in five minutes |
| Cycle life | Up to 100,000 cycles |
| Usable capacity | Full charge to full discharge |
| Electrolyte | No flammable liquid electrolyte |
| Vehicles | Verge TS Pro and Ultra motorcycles |
The announcement also said first customer deliveries would begin in Q1 2026. That delivery claim is no longer consistent with the current Verge TS Pro product page, which lists estimated delivery in Q4 2026 for the United States and European Union, and Q4 2027 for the United Kingdom and other regions.
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Donut Lab commissioned Finland’s VTT Technical Research Centre to perform battery measurements. VTT confirms that it carried out measurements at Donut Lab’s request, with Donut Lab publishing the results. That makes the work a commissioned product-development test—not a general independent certification of every specification in Donut Lab’s marketing.
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In the charging test, an individual cell reached:
- 80% in approximately 9.5 minutes and 100% in slightly more than 12 minutes at 5C.
- 80% in approximately 4.5 minutes and 100% in slightly more than seven minutes at 11C.
A C-rate expresses charging current relative to the cell’s capacity. An 11C charge is extremely aggressive: in simple theoretical terms, it represents enough current to charge a cell in roughly 5.5 minutes, before accounting for the tapering that occurs near full charge. It is not the same as charging a complete motorcycle pack at a public charger.
The test used passive aluminium cooling plates rather than the active thermal-management system that would be required in a vehicle. Donut Lab also acknowledged that the experiment did not directly reproduce how the cell would behave inside a production battery pack. The result therefore supports a narrower statement: a tested cell reached full charge in just over seven minutes under specified laboratory conditions at 11C. It does not establish a five-minute zero-to-100% charge for a road-going motorcycle.
The published VTT report does not verify the chemistry
A separate VTT swelling-test report identifies the sample as “Donut Lab Battery V1.” Its listed characteristics include a 26 Ah nominal capacity, 3.6 V nominal voltage and 94 Wh nominal energy. It gives a recommended operating range of 2.7 to 4.15 V, with standard CC-CV charging at 1C and a maximum charging voltage of 4.3 V.
The report describes a pouch cell tested in a ComprePouch device while its thickness was monitored during cycling. It does not identify the cell chemistry as solid-state. It also does not validate the claimed 400 Wh/kg energy density or 100,000-cycle life.
That distinction matters because a swelling measurement can provide useful information about cell behaviour, but it is not by itself a chemistry certificate. To substantiate the solid-state claim, Donut Lab would need to publish sufficiently detailed, independently reproducible evidence about the electrolyte, electrodes, cell construction and production version used in the motorcycle.
Independent investigators dispute the solid-state and 400 Wh/kg claims
A June 2026 investigation led by battery researcher Ryan Inis Hughes, known online as Ziroth, consulted more than 20 battery specialists. The investigators said the published voltage curves and swelling data looked more consistent with a conventional high-nickel lithium-ion cell than with the sodium-ion solid-state chemistry previously associated with Donut Lab’s technology claims.
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The investigation highlighted voltage behaviour around 3.7–3.8 V at 50% state of charge and a swelling-curve feature associated with lithium-ion cells using graphite anodes. It also estimated the cell’s energy density at approximately 298 Wh/kg—substantially below Donut Lab’s 400 Wh/kg figure.
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Those findings are reported conclusions from the investigation and its consulting experts, not a court ruling or a publicly released government laboratory determination. Donut Lab rejects the allegations. In a June 9 statement, the company said it stood behind its technical data and commitments, argued that the investigation repeated earlier claims, and pointed to Hughes’s disclosed commercial relationship with CATL, which Donut Lab described as a competitor. Donut Lab also disputed the relevance of comments from former Nordic Nano employee Lauri Peltola.
The biggest claims remain unverified
The public test material does not establish the following:
- 400 Wh/kg at the production-pack level.
- A 100,000-cycle service life.
- A five-minute full charge for a complete motorcycle battery.
- That the production cell contains no liquid electrolyte.
- Safety across the temperature, vibration, impact and charging conditions encountered by a road vehicle.
- That customer motorcycles have already been delivered with cells matching the advertised specifications.
Electrek reported that five VTT tests had been published without directly testing the two most important long-term performance claims: 400 Wh/kg and 100,000 cycles. A product can still be promising without those tests, but the absence of that evidence means the numbers should be treated as company claims rather than independently verified specifications.
Are Donut Lab batteries actually on the road?
Donut Lab says its battery is the world’s first all-solid-state battery in production vehicles, and its battery page continues to present the five-minute, 400 Wh/kg and 100,000-cycle figures. However, the available vehicle evidence does not show ordinary customer use at those specifications.
The Verge TS Pro page lists the motorcycle as using Donut Lab’s all-solid-state battery, but its current estimated delivery window is Q4 2026 for U.S. and EU buyers. That supersedes—or at minimum contradicts—the earlier Q1 2026 delivery expectation. Until customer deliveries occur and the production battery is independently characterised, “on the road” should mean a claimed planned application, not a verified fleet deployment.
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What would settle the dispute?
The most useful evidence would be straightforward and independently checkable:
- A full technical datasheet for the exact production cell and pack, including mass, usable energy and test temperature.
- An independently witnessed zero-to-100% charge test on a complete motorcycle pack, with charger power, voltage, current and thermal limits disclosed.
- Third-party energy-density measurements based on the complete cell and, separately, the complete pack.
- Long-duration cycling data showing the test protocol, depth of discharge, charge rate, temperature and capacity-retention endpoint.
- A clear description of the electrolyte and cell architecture, rather than relying only on the “solid-state” label.
- Evidence from delivered production motorcycles, including the battery serialisation and specifications of the cells installed.
Until that information is available, the VTT charging result is best understood as an encouraging but limited cell-level demonstration—not proof that Donut Lab has placed a five-minute solid-state battery into customer motorcycles.
FAQ
Has Donut Lab delivered a five-minute solid-state battery to customers?
There is no public evidence establishing that it has. Donut Lab originally said Verge motorcycle deliveries would begin in Q1 2026, but Verge’s current TS Pro page lists estimated U.S. and EU delivery in Q4 2026.
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Did VTT confirm a five-minute full charge?
No. Donut Lab’s published summary says an individual cell reached full charge in slightly more than seven minutes at 11C, and slightly more than 12 minutes at 5C. The test did not directly reproduce a complete vehicle battery pack.
Did VTT verify Donut Lab’s solid-state chemistry?
Not in the publicly available swelling-test report. The report identifies the tested pouch cell and records its electrical and swelling measurements, but does not establish that its chemistry is solid-state.
Are the 400 Wh/kg and 100,000-cycle claims independently proven?
They have not been established by the publicly described VTT tests. An independent investigation reported evidence suggesting a conventional lithium-ion cell and estimated approximately 298 Wh/kg, while Donut Lab rejects those conclusions.
The Bottom Line
Donut Lab has announced an ambitious solid-state battery and produced a commissioned test showing rapid charging of an individual cell. That is not the same as proving a five-minute full charge, 400 Wh/kg, 100,000 cycles or customer delivery in road-going motorcycles. For now, the most accurate description is a claimed production battery with limited public validation, disputed chemistry and a vehicle delivery schedule that has moved to Q4 2026 for U.S. and EU Verge TS Pro orders.
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