Fair enough. Here you go.
Third Party Testing
This website serves as the platform for publishing validation results and technical documentation related to the Donut Solid State Battery. Donut Lab has commissioned the internationally renowned VTT Technical Research Centre of Finland to conduct independent measurements of the battery’s performance and key characteristics. Unless otherwise stated, all tests presented here have been conducted by VTT. Full reports will be published alongside detailed video documentation that walks through the procedures, showcases the test setups, and explains the results.
Introducing “I Donut Believe”
Donut Lab has commissioned internationally respected VTT Technical Research Centre of Finland to independently measure the performance and characteristics of its solid-state battery. Through third-party testing under controlled research conditions, Donut Lab provides verified data to support its performance claims. In the video, CEO Marko Lehtimäki explains the company’s perspective and the rationale for launching the series and publishing the results in this format.
Fast Charge Performance Test
The first independent test of the Donut Solid State Battery, conducted by VTT Technical Research Centre of Finland, evaluates its charge performance under demanding conditions without active cooling. The cell was tested at both 5C and extreme 11C charge rates, confirming previously stated fast-charging targets, including a 0–80% charge in just 4.5 minutes at 11C. The results demonstrate exceptional charging capability alongside stable thermal behavior, providing verification of the battery’s high-power performance.
High Temp Performance Test
The 2nd independent test of the Donut Solid State Battery, conducted by VTT, evaluates its capacity and operational stability under sustained high-temperature conditions. At 80°C, the battery delivered 110% of its nominal room-temperature capacity with improved efficiency due to reduced internal resistance. After multiple hours at 100°C, it maintained approximately 107% capacity and recharged to full without degradation, confirming stable performance in environments exceeding the safe operating limits of conventional Li-ion batteries.
Self-Discharge Test
The 3rd independent test of the Donut Battery, conducted by VTT, evaluates its charge retention over an extended idle period. The cell was connected to a battery tester for ten days, with voltage measured every 10 seconds. Cell voltage stabilised within the first 10 hours and remained level for the remaining nine and a half days, confirming normal battery-type charge retention – not the rapid linear discharge characteristic of supercapacitors. The results demonstrate stable, predictable energy storage suitable for real-world vehicle applications.
Verge Motorcycles
Sneak Peek: Fast Charging Solid-State Battery Pack
Unlike the previous instalments, this test was not conducted by VTT. It was captured at a public charging station during a system validation session with our customer Verge Motorcycles. A previous-generation mule bike equipped with a Donut solid-state battery pack demonstrated pack-level 5C fast charging on the standard range variant — an 18 kWh (nominal capacity), fully air-cooled design. Three times faster charging than the previous model year, and the fastest of any production electric motorcycle.