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Hacker News Hacker NewsVTT is a company that you pay to run tests for you. You bring them a product, tell them what tests you need done, and then they do them with honesty and expensive well calibrated gear. Frequently you also send engineers along with your product to provide on the spot support for the testing. It's very likely it was a Donut engineer who setup the cell, attached the heatsinks, adjusted the connections, etc. This is pretty standard, VTT just runs verified tests, they're not experts on your product. Then they give you an official honest report recapping the tests done and the results.
VTT is not an auditor for verifying claims, at least beyond the scope of the test you task them to do. They are a friendly business partner that you pay large amounts of money to for getting you verified tests done on your product.
I really cannot stress enough that VTT is not in it to disprove anything. It's incredibly suspect that in a battery capacity test, Donut did not have VTT verify cell weight or dimension. It's also important to understand that VTT would not request to do this either, because VTT just runs the tests you pay them to, as you tell them to do it. So if donut shows up with a different cell for each test, VTT would not skip a beat, because they are not auditing, they are just doing the tests they are paid to do.
Normally places like VTT thrive on compliance testing, where a regulation outlays the tests needed to be passed, and VTT provides the service of being the third party to run and sign off on those tests. Those tests are then submitted to the regulating body and they are the ones who pass/fail you, not VTT. They just do tests and collect money.
So Donut is writing their own "regulations" here, so they are just having VTT do whatever tests they want as they want them done.
The real test would be someone not affliated with donut taking one of these cells to VTT.
Like, EEStor or Nikola with big claims, timelines pushed years out, raise a ton of money, delay forever. Donut announced at CES and said bikes ship Q1 2026 which is weeks from now. They've raised ~€25M total (QuantumScape has burned through $1.5B+). And apparently they're not doing a big fundraise right now either.
If it's a scam it seems like a really bad strategy? You're basically setting a timer on your own credibility.
I've been reading around and the thing I keep landing on is the Nordic Nano connection. They're a Finnish nanotech company Donut invested in, and they published specs for a "bipolar electrostatic capacitor" with basically identical numbers - 400 Wh/kg, 100k cycles, fireproof. Does anyone with more battery knowledge know if this could be some kind of supercapacitor hybrid being marketed as a solid-state battery? The VTT report confirms fast charging works but doesn't say anything about energy density, cycle life, or what this thing actually is.
Seems like the energy density and cycle life reports (supposedly coming in the next few weeks) are going to be way more interesting than this one.
The founders have sketchy track records. They do a carefully managed social media build-up. There are credible rumors that they’ve been simultaneously raising money by cold-calling moderately wealthy people around the country. (Finland has extremely little oversight for private fundraising; you can basically sell shares in your zero-revenue startup to grandma next door — as long as you’re careful about wording your claims as “projections”.)
So lots of red flags. Everyone would love it to be real of course because it’s been a long since Finland’s tech scene had a global hit like Nokia and Supercell… And perhaps the Donut founders are counting on that mood.
All of current existing Verge motorcycles have a "traditional" lithium ion ~20kWh battery pack[0], very much on par with competition in all specs. They do exist and a few indeed appear to be in owners' hands (according to Facebook Verge fangroup posts and pics), and they can be test ridden. One of their showrooms is in Valley Fair in San Jose, CA. I have tested one of them. It feels and seems to perform well, as advertized and as physics allow, despite the hubless engine and skepticism around that. However, the test ride was ~30 minutes and there's so few of those bikes out there, that there's virtually no data on longevity.
What currently does not exist is a Verge motorcycle with the battery that they claim to be testing here. They have announced that all their offerings will feature their solid state battery later this year, increasing the energy capacity to ~30kWh. That remains to be seen.
[0] https://web.archive.org/web/20260223173926/https://www.verge...
Mercedes has a test car with a solid state battery.[1] The battery is from Factorial Energy. There's only one such car, and they don't say how much it cost to make the prototype battery.
Ducati has a test motorcycle with a solid state battery.[2] The battery is from QuantumScape. There's only one such motorcycle.
Here's Fraunhofer IKTS making a solid state battery at lab scale.[3] The whole process is shown. Huge amount of effort to make one coin cell.
Samsung prototype.[4] Samsung has been talking about shipping tiny solid state batteries for wearables in 2026. Still too expensive for cell phones, which gives a sense of cost.
All the serious players can make a prototype by now. But the chemistry that's used for the prototypes may not be suitable for production. They have to balance capacity, weight, charge time, cycle life, manufacturing cost, and materials cost. (Samsung made a battery with a substantial silver content. It works, but that's not going to be a volume product)
These problems will be overcome, because throwing money at them works. The history of the tungsten-filament light bulb is worth reviewing. Making fine tungsten wire is very difficult. From 1913 to 2010, a huge plant in Euclid, Ohio, made most of the tungsten wire for light bulbs. There were a lot of process steps.[5]
[1] https://electrek.co/2025/02/24/mercedes-tests-first-solid-st...
[2] https://www.ducati.com/ww/en/news/ducati-s-electric-research...
[3] https://www.youtube.com/watch?v=j5SVrp8N-1M
He's been a busy beaver!
The people listed on this report appear to be on LinkedIn, so I guess it will be easy to confirm if the test document is authentic.
The announcement of the test: https://youtu.be/d2QU_LpkSPs
Hopefully, soon we will find out if this seemingly "too good to be true" is a revolution or something else.
Specs
26 Ah nominal capacity at 1C discharge rate
94 Wh nominal energy with 3.6V nominal voltage
Operates within 2.7V – 4.15V recommended range (max charging to 4.3V)
5C charging (130A): 0-80% in ~9.5 minutes, 0-100% in ~13.5 minutes
11C charging (286A): 0-80% in ~4.9 minutes, 0-100% in ~7.3 minutes
Successfully delivered 98.4-99.6% of charged capacity even after extreme 11C charging
Tested with both one-sided and two-sided heat sinks to simulate real-world conditions
With dual heat sinks: Peak temps of 47°C (5C) and 63°C (11C) — well within safe limits
With single heat sink: Reached 61.5°C (5C) and up to 89°C (11C) — still functional but approaching thermal limit
Energy density: No weight and volume was mentioned
Cycle life: VTT ran only 7 test cycles total.
Cost Claims: Nothing about cost is mentioned
Material Claims: No chemical analysis or materials analysis.
Extreme Temperature Performance: No cold weather testing. No high-temperature testing.
No abuse testing: No nail penetration, no overcharge, no short-circuit, no crush tests.
> This project included independent charging performance tests on the energy storage devices supplied by the customer, which the customer identified as solid-state battery cells.
> which the customer identified as solid-state battery cells.