Donut Lab Reveals Amazing Performance Tests

A company called Donut Lab has released new test results backing up its claims about a solid-state battery, a type of battery that swaps the liquid electrolyte in a normal lithium battery for a solid one. Solid-state batteries are considered a major goal for the industry because they promise more energy storage in a smaller, lighter package and better safety, but nobody has managed to sell one at scale before. Donut Lab first showed its battery at CES 2026 and drew heavy skepticism, with some critics calling it a scam or claiming it was really just a repackaged ordinary battery.

The new data shows the battery survived a nail-penetration test (a standard safety check where a nail is driven into the battery) with no fire, smoke, or explosion. The battery also measured 409 watt-hours per kilogram and 804 watt-hours per liter, both notably high figures for energy storage per weight and per volume. Engineers disassembled a cell and found it built from stacked layers with no liquid electrolyte and no isolation between layers, which is only possible with solid-state construction. The manufacturing method also uses printing rather than the toxic solvents and expensive sealed rooms required for conventional batteries, which could make it cheaper to produce.

For homeowners, this is still lab and early-production news, not a product on the market. Two big questions remain unanswered: how many charge cycles the battery can handle over time, and how well it performs in cold temperatures down to -30°C. Until those results appear, there's nothing yet to act on for home batteries or electric vehicles.