#VTT

All articles tagged with "VTT"

Donut Lab solid-state battery retains 97.7% charge after 10 days in third test

Donut Lab Battery Keeps 97.7% Charge After 10 Days Idle

Independent testing confirms Donut Lab's solid-state battery retains 97.7% charge after 10 days, but the startup's most extraordinary claims remain unverified.

Key Takeaways

Third VTT test confirms 97.7% charge retention over 10 days
Most extraordinary energy density and charging speed claims remain untested

DT Editorial Team·Mar 10, 2026·4 min read·via electrek.co

Donut Lab Solid-State Battery Survives 100C in Independent Test

Finland's VTT research center confirmed Donut Lab's solid-state cell gained capacity at extreme heat, but key claims on density and cycle life remain unverified.

Key Takeaways

Cell delivered 110% of rated capacity at 80C in independent VTT testing
Battery survived 100C discharge but lost pouch vacuum seal

DT Editorial Team·Mar 2, 2026·4 min read·via electrek.co