# Factorial reports first aerospace battery cell revenue and 450 Wh/kg cell energy density

- Published: 2026-11-11 12:31 UTC
- Section: Power & Energy › Batteries
- Tags: Factorial first revenue, aerospace battery cells, 450 Wh/kg energy density, FEST solid-state battery, Solstice sulfide battery, SK On memorandum, Mitsui Kinzoku electrolyte, Titan Dynamics drone
- URL: https://realtech.media/news/rt-920413c2382828c2b5ff95bc_factorial_reports_first/

**Factorial booked its first revenue from aerospace cells ahead of its 2027 plan. The 450 Wh/kg is achieved for these cells, while for Solstice it remains a design target.**

![Factorial reports first aerospace battery cell revenue and 450 Wh/kg cell energy density](https://realtech.media/media/2026/11/41468bf52b2865d3.webp)
*xenospectrum.com*

US battery developer Factorial announced on 10 November 2026 that in the third quarter (July–September) it booked its first revenue from aerospace battery cells: twenty-six thousand dollars. The company had previously expected first revenue in 2027. It also said it reached an energy density of 450 Wh/kg in aerospace cells, according to xenospectrum.com, which cites the company's shareholder letter and Form 10-Q. [1]

## Aerospace cells and the 450 Wh/kg figure

According to the letter signed by co-founder and CEO Siyu Huang, deliveries began under a commercial order won in July. Revenue in the same quarter a year earlier was zero, and the new amount equals cumulative revenue for January–September 2026. [1] The customer name, the number of cells and the unit price were not disclosed. [1]

The aerospace cells are based on the FEST polymer solid-state design and use a lithium metal anode. For them 450 Wh/kg is an achieved result. For Solstice, a sulfide-based all-solid-state cell for automobiles, the same figure is a design target. Solstice cells of up to 40 Ah have been made and are at the partner validation stage. [1]

Factorial says the new value is about 15% above the cells used in a drone that set a flight record in 2026. A Titan Dynamics Group I drone (20 lb or less) with Factorial cells flew for more than eight and a half hours in July. The 450 Wh/kg cells were not used in that flight, and the 15% compares the cells alone, not battery packs or flight time. The letter gives no detailed test conditions or cycle-life data. [1]

## Production, cost and partners

Factorial says the FEST process can reuse up to 80% of conventional lithium-ion production equipment. Yield at the pilot line exceeded 85%; this has not been confirmed for partner plants. [1] In July the company signed a memorandum with SK On to assess production in its existing manufacturing network. In September it signed a joint development agreement for Solstice with Mitsui Kinzoku, which develops the sulfide solid electrolyte, while POSCO Future M works on cathode and anode materials. [1]

The company plans to finish expanding the FEST line by the end of 2027 and the Solstice line by the end of 2028. In January it received an order for supercars. Its next main goal is a mass-production purchase agreement with a mainstream automaker. [1]

At current low volumes, the manufacturing cost of one cell exceeds the intended selling price, the letter states. Most of the quarter's cost of revenue is an inventory write-down; it also includes labor, overhead and materials for drone cells, so it cannot be divided by revenue to get a per-cell loss. [1] The operating result was a loss. GAAP net profit for the quarter was driven largely by a non-cash gain from revaluing warrant liabilities, so the cell business itself is not yet profitable. Factorial expects more substantial commercial revenue in 2027 and small, variable quarterly revenue until then. [1]

## Sources

1. [xenospectrum.com](https://xenospectrum.com/factorial-first-revenue-battery-milestones)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-920413c2382828c2b5ff95bc_factorial_reports_first/