Overview
- VTT charged the DL1 cell to roughly 50% state of charge and, after 240 hours at 22–28°C, recovered 97.7% of the input energy.
- Voltage dropped about 60 mV in the first 10 seconds and 103 mV in the first hour, then drifted only 12 mV from hour 10 to hour 240, indicating stabilization rather than ongoing self-discharge.
- The lab reported normal battery-type charge retention, countering speculation that the device is a supercapacitor.
- An initial 1C capacity check measured 26.5 Ah, and VTT noted no visible damage or structural changes to the cell after testing.
- Earlier VTT reports verified 0–80% charging in about 4.5 minutes at roughly 11C and high-temperature discharge up to 100°C, while cell mass, energy density of 400 Wh/kg, and a 100,000-cycle lifespan remain unverified as CEO Marko Lehtimäki touts near-term Verge Motorcycles deliveries.