SIGNALInfrastructure Software·Jun 9, 2026, 12:26 PMSignal75Medium term

Startup’s ‘miracle’ solid-state battery actually uses lithium-ion chemistry, according to third-party tests — Donut Lab raised $25M and is valued at $1.25B on what now appear to be debunked claims

Source: Tom's Hardware

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Startup’s ‘miracle’ solid-state battery actually uses lithium-ion chemistry, according to third-party tests — Donut Lab raised $25M and is valued at $1.25B on what now appear to be debunked claims

A Finnish startup’s startling claims to have a production-ready ‘miracle’ solid-state battery have thoroughly collapsed under independent scrutiny.

Why this matters
Why now

The increased scrutiny on breakthrough battery technologies, combined with the continuous search for viable solid-state solutions, makes independent verification critical right now.

Why it’s important

This incident highlights the pervasive issue of hype in the deep tech sector, particularly for high-value industries like batteries, and underscores the risk for investors and end-users.

What changes

Investor confidence in rapidly funded, unverified 'breakthrough' battery startups will likely decrease, leading to more cautious due diligence processes in the energy storage sector.

Winners
  • · Established battery manufacturers
  • · Independent battery testing labs
  • · Companies with proven battery technologies
Losers
  • · Donut Lab
  • · Early-stage deep tech investors
  • · Speculative battery startups
Second-order effects
Direct

Donut Lab's valuation collapses, and its credibility is severely damaged.

Second

Investors become significantly more skeptical of unproven 'miracle' battery technologies, demanding more rigorous validation during fundraising.

Third

The overall development timeline for solid-state batteries might be perceived as longer or riskier due to this high-profile failure, potentially shifting capital to other energy storage solutions.

Editorial confidence: 95 / 100 · Structural impact: 60 / 100
Original report

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Read at Tom's Hardware
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