VTT Test Donut Lab Battery Reaches 80% Charge in Under 10 Minutes [pdf]

Post by xienze » Mon, Feb 23, 2026, 1:36 PM UTC

make_it_sure wrote: post #9

xienze wrote: post #7

Fairly important bit here at the end: > 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.

why?

Post by Tommix11 » Mon, Feb 23, 2026, 1:40 PM UTC

coffeebeqn wrote: post #5

dagurp wrote: post #3

Earlier quoted context omitted.

You can take a look at the announcement video https://youtu.be/Y-aPS2AwMbc?si=RD4Ja8tJggLPgXGj

The pdf also has a picture of it where you could possibly reverse Engineer the dimensions based on the other things in the picture. Looks very flat like an iPad battery

Post by andor » Mon, Feb 23, 2026, 1:42 PM UTC

kevlened wrote: post #6

mrtksn wrote: post #4

Apparently the first 3rd party test was on fast charging and the 3rd party is VTT, which is the government affiliated(owned?) "VTT Technical Research Centre of Finland" 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…

> They also published the report here: https://pub-fee113bb711e441db5c353d2d31abbb3.r2.dev/VTT_CR_0... That's the same link. Is there a way to attest that this is an official VTT report?

Post by sagyam » Mon, Feb 23, 2026, 1:44 PM UTC

    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.

Post by mrtksn » Mon, Feb 23, 2026, 1:46 PM UTC

vipulbhj wrote: post #10

mrtksn wrote: post #4

Apparently the first 3rd party test was on fast charging and the 3rd party is VTT, which is the government affiliated(owned?) "VTT Technical Research Centre of Finland" 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…

I’ve been digging into the data (using Gemini and a few other sources). The claims behind https://idonutbelieve.com/ are pretty bold. I’d like to be optimistic, but I’m going to wait for more independent verification before drawing any conclusions.