Donut Lab Starts to Release Independent Test Results of Their Solid State Battery
February 23rd, 2026Donut Lab only released charge rate information so far, along with a countdown to the next release of test results. While they appear to want the controversy to drag on for as long as possible, at least they are moving in the right direction with the release of some information.
I was really hoping for confirmation of power density, but we’re going to have to wait for that.
Via: The Verge:
Since announcing earlier this year that it was on the cusp of a major battery breakthrough, Finnish startup Donut Lab has faced a lot of questions, and plenty of skepticism, about its production-ready, solid-state battery. Could the company really make a fast-charging battery at scale while avoiding some of the theoretical production headaches that have stymied past efforts? Today, Donut Lab sought to dispel some of the doubts with the release of the first independent test of its battery, evaluating its charging speed and the “thermal behavior” of its pack.
The test, which was conducted by state-owned VTT Technical Research Centre of Finland, concludes that the battery is able to be charged significantly faster than a traditional lithium-ion battery. In several tests, the battery was able to charge from 0–80 percent in around 9.5 minutes, while retaining 100 percent of its capacity. In other tests, 0–80 percent was achieved in about 4.5 minutes while retaining 99 percent capacity.
