Donut Lab, a Finnish company, has unveiled the first test results for its solid-state battery, which indicate a charging speed that meets the company's ambitious claims. Preliminary findings reveal that the battery charged to 80% in just 4.5 minutes during an 11C test and reached full charge in under seven minutes. This aligns closely with Donut Lab's promotional assertions that the battery's performance exceeds any commercially available lithium-ion battery currently on the market.

The company also made the test report from VTT, a Finnish research institute, publicly available on its website. The report confirms that the battery tested was a genuine prototype subjected to rigorous evaluations at VTT's laboratory. The measurement process began with a standard 1C discharge capacity test, followed by rapid charge tests at 5C and 11C rates utilizing various cooling configurations.

Experts have pointed out that while the results are impressive, there is a notable number that has not been disclosed, which raises questions about the transparency and overall reliability of the test outcomes. Despite the strong initial performance data, further scrutiny will be necessary to determine how these batteries will perform in real-world conditions and under continuous usage, thereby ensuring their practicality and safety for consumers.