This company claims a battery breakthrough. Now they need to prove it.

2026-02-26 · Source: MIT Technology Review · Field: Transportation & Mobility — Electric & Alternative Fuel Vehicles, Logistics & Freight Transportation, Mobility Services & Technology · Depth: Intermediate, extended

Summary

Donut Lab, a Finnish company, announced a new solid-state battery technology in February 2026, claiming it is ready for large-scale production and offers significant advancements over current lithium-ion batteries. Their batteries reportedly achieve an energy density of 400 Wh/kg, charge from 0% to 80% in approximately 4.5 minutes, last 100,000 cycles, and retain 99% capacity across extreme temperatures (-30°C to >100°C). Furthermore, Donut Lab claims these batteries are safer, use "100% green and abundant materials," and cost less than existing lithium-ion cells. While experts express skepticism due to the lack of detailed technical information and the contradictory nature of some claims, Donut Lab has begun releasing a video series, "I Donut Believe," to provide third-party test results, starting with a fast-charging demonstration.

Key takeaway

For entrepreneurs and R&D teams evaluating next-generation EV battery technologies, Donut Lab's claims, if validated, represent a significant shift. You should closely monitor their ongoing "I Donut Believe" video series for further third-party test results, particularly concerning cycle life and sustained performance across all claimed parameters. This could inform your strategic decisions on future product roadmaps and material sourcing, especially if the cost and material abundance claims hold true.

Key insights

Donut Lab claims a no-compromise, production-ready solid-state battery surpassing current EV battery limitations.

Principles

• High energy density often conflicts with fast charging.
• Cost-effective battery solutions are crucial for mass adoption.
• Extraordinary claims require extraordinary proof.

Method

Donut Lab proposes a "no-compromise" all-solid-state battery system, engineered with integrated pack electronics, thermal management, and safety features, designed for scalability across diverse applications.

In practice

• Target 400 Wh/kg energy density for extended EV range.
• Aim for sub-5-minute charging times for user convenience.
• Design for 100,000 cycles to enhance total cost of ownership.

Topics

• Solid-State Batteries
• Electric Vehicle Batteries
• Battery Energy Density
• Fast Charging Technology
• Battery Materials

Best for: Entrepreneur, Product Manager, CTO, Investor

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Editorial summary, takeaway, and curation by AIssential. Original article published by MIT Technology Review.