What did CATL's eVTOL battery just achieve?

CATL said its aviation battery system for eVTOLs passed a safety test in which two adjacent cells were deliberately pushed into thermal runaway at the same time. The failure did not spread to nearby cells.

Why does a dual-cell test matter?

Most propagation tests trigger only one cell. Triggering two cells at once, at different points in the pack, is a tougher test of how well the safety system contains a fault.

CATL is the world's largest maker of batteries for electric vehicles, holding close to 40 percent of the global market in the first half of 2026.

AutoFlight is a Chinese company that builds electric vertical take off and landing aircraft, including a cargo model already certified in China and a passenger model still working through certification.

What is the Prosperity aircraft?

The Prosperity is AutoFlight's passenger eVTOL, designed to carry a pilot and up to five passengers. It is the aircraft CATL's tested battery is intended to power.

Does this mean eVTOL flights are ready to carry passengers?

No. Passing this safety test is one step in a longer process. The Prosperity itself still needs its own separate airworthiness certification from Chinese aviation authorities before it can carry passengers commercially.

What happens next for the battery and the aircraft?

CATL said the battery is ready to move into mass production. AutoFlight's Prosperity still needs to complete its own certification process, which the company has said it is aiming to finish in 2026.

What certification stage is AutoFlight's Prosperity currently in?

AutoFlight's Prosperity has completed the G-2 means of compliance approval process with the CAAC and entered flight and compliance verification testing. Type certification is expected by late 2026 or early 2027, according to Aviation Week Network. This certification track is separate from the battery propagation test itself.

What is CATL's investment relationship with AutoFlight?

CATL became a strategic investor in AutoFlight in August 2024, committing several hundred million dollars, with the partnership structured around joint research and development on eVTOL battery energy density and performance. The companies have also collaborated on infrastructure, including a floating vertiport unveiled in November 2025.

What are the technical specifications involved?

CATL's tested battery reaches an energy density of up to 350 Wh per kg using a prismatic cell format. The Prosperity aircraft itself has a stated battery capacity of 173.8 kWh and an operational range of 200 km, according to AutoFlight's own published specifications.

CATL’s eVTOL battery holds under a harder failure test

Category: Aerospace, Batteries, Components & Technology, Materials & Manufacturing, Sectors, Testing & Validation

August 11, 2026

AutoFlight's V2000EM Prosperity, the five-passenger eVTOL that CATL's newly tested aviation battery system is destined to power.

The Prosperity is undergoing its own CAAC airworthiness certification, a separate process from the battery safety test itself

(Image courtesy of AutoFlight)

CATL said its 350 Wh/kg aviation battery system showed no thermal runaway propagation when two adjacent cells were triggered simultaneously, a more demanding trigger method than the single-cell approach commonly described in trade reporting on aviation battery testing. Designated representatives of China’s Civil Aviation Administration witnessed the process throughout. The result positions the battery for use in AutoFlight’s passenger eVTOLs, though aircraft-level certification remains a separate and unfinished process.

A more demanding test for CATL’s eVTOL battery

Most aviation battery propagation tests trigger a single cell and confirm the failure does not spread to neighbouring cells. CATL’s went further. It simultaneously triggered two adjacent cells at different locations within the pack, including both the middle and the corners, with no propagation to surrounding cells in either case. CATL describes the result as a world first for a prismatic-cell aviation battery system at up to 350 Wh/kg energy density, a claim that so far rests on the company’s own statement.

What CAAC involvement actually signals

Designated representatives of the Civil Aviation Administration of China witnessed the production, inspection, and testing of the cells and the battery system throughout. That witnessing lays groundwork for eventual certification, but it does not itself demonstrate the battery’s conformity with civil aviation standards, and further approval steps remain before the system can carry passengers commercially.

That distinction matters for procurement teams evaluating supplier readiness. A battery system can be manufacturing ready and safety verified at the cell and pack level while the aircraft integrating it remains well short of a type certificate. AutoFlight’s own record illustrates the gap. Its CarryAll cargo eVTOL holds the full set of CAAC airworthiness approvals. It received a Type Certificate in March 2024, a Production Certificate in December 2024, and an Airworthiness Certificate in July 2025. That status applies specifically to the uncrewed cargo variant. The passenger programme CATL’s battery is destined for sits on a separate track. CAAC accepted the type certificate application for AutoFlight’s passenger eVTOL in April 2024, and verification and compliance testing were reported under way as of late 2025, with AutoFlight targeting certification in 2026.

Supply chain alignment behind the headline

CATL’s relationship with AutoFlight extends well beyond a supplier contract. CATL became a strategic investor in AutoFlight in August 2024, committing several hundred million dollars. The two companies jointly unveiled a floating vertiport integrating eVTOL landing infrastructure with photovoltaic charging in November 2025, a separate infrastructure collaboration that underscores how closely the two companies are aligned. The battery announcement extends that alignment into the propulsion stack itself.

CATL installed 242.7 GWh of EV, PHEV, and HEV batteries globally in the first half of 2026, up 25.3 percent year on year, lifting its market share from 38.2 to 39.9 percent according to SNE Research. That road-vehicle dominance now extends into aviation through its work with AutoFlight, though it is AutoFlight’s own certification timeline, not the battery’s readiness, that will determine when any of this reaches commercial service.

The Prosperity’s own certification clock is now the thing to watch. If AutoFlight holds its 2026 target, this battery result stops being a lab milestone and becomes the thing that got a passenger aircraft into the air.

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