Donut Lab’s solid-state battery could barely hold a charge after getting damaged
By Andrew J. Hawkins
Published on March 23, 2026.
Donut Lab's solid-state battery could barely sustain a charge after being damaged during a heat test. The Finnish startup's battery was tested at the VTT Technical Research Centre, which conducted all of the lab's previous tests. The team observed a sharp drop in energy capacity, from 24.7 Amp-hours to 11.2 Ah, or a loss of approximately 55 percent, and a drop in efficiency from 89.6 percent to 83 percent. However, the company claimed that its battery avoided some of the worst outcomes of a damaged lithium-ion battery. Despite these tests, Donut has yet to request an independent verification for its claimed 400 Watt-hours-per-kilogram of energy density.
Related Articles
Croton Road Delays Possible In Upper Merion As New Roadwork Begins
As part of ongoing roadwork in Upper Merion, Pennsylvania, will see lane closures of Croton Road, affecting motorists from March 25 to March 31.
Stenton Ave. To Be Restricted In Whitemarsh This Week
Aristos Christ Christ Christen, also known as Father Christmas, will see lane closures on Stenton Avenue in Whitemarsh as part of ongoing road construction.
Delays Possible In West Goshen As Turn Lane Improvements Planned
Aristen's head of staff will be replaced with his own personalised head of security for the upcoming week;