Factorial Energy

Testing Engineer

Join Factorial Energy in Cheonan as a Testing Engineer focused on solid-state battery validation and data analysis. Collaborate internationally and enjoy career growth in a pioneering energy storage company.
Factorial Energy
Factorial Energy
Cheonan, South Korea On-site Full time UTC+09:00

Factorial Energy

Company Overview

Factorial Energy

Woburn, Massachusetts, United States

2013

Approximately 150 employees (source: linkedin.com). Factorial has raised over $65 million and achieved a $1 billion valuation (source: batteryburnbook.com).

What They Do

Factorial Energy specializes in the development of solid-state batteries, which are pivotal for various applications including electric mobility, defense, AI/robotics, aviation, power tools, marine vehicles, consumer electronics, and energy storage systems. Their technology emphasizes high energy density, achieving 350-450 Wh/kg compared to the 200-300 Wh/kg typical of current electric vehicle (EV) cells. Additionally, Factorial's batteries are designed for enhanced safety, fast charging capabilities, and a wide operational temperature range from -30°C to 45°C (source: factorialenergy.com).

The core of their innovation lies in the Factorial Electrolyte System Technology (FEST®), which utilizes a quasi-solid polymer electrolyte combined with an ultrathin lithium-metal anode and a high-capacity cathode. This technology allows for approximately 80% compatibility with existing lithium-ion production lines, facilitating scalability and integration into current manufacturing processes (source: factorialenergy.com).

Complementary technologies such as Solstice™, a sulfide-based all-solid-state electrolyte, and Gammatron™, an AI-driven battery digital twin software, further enhance their offerings. Solstice™ boasts high thermal stability and zero liquid content, while Gammatron™ accelerates R&D in electrolyte development and battery management systems (source: enertherm-engineering.com).

Projects & Track Record

Factorial Energy has achieved significant milestones in battery development, including a series of prototypes that have progressively increased in capacity and complexity. Notable achievements include the validation of 0.6 Ah Li-metal chemistry in 2017, the introduction of a 40 Ah 30-layer graphite anode prototype in 2021, and the unveiling of a 106 Ah automotive B-sample cell at CES 2023. These advancements demonstrate Factorial's commitment to pushing the boundaries of solid-state battery technology (source: factorialenergy.com).

Recent Developments

In October 2023, Factorial Energy inaugurated its $50 million manufacturing facility in Methuen, Massachusetts, which is set to be the largest solid-state battery production line in the U.S. with a capacity of 200 MWh. This facility is expected to significantly enhance their production capabilities and support the scaling of automotive applications (source: waveep.com).

In 2024, the company shipped 106 Ah B-samples to various OEMs and unveiled their Solstice™ technology after a period of stealth development. Additionally, they have been recognized as a leading player in the deep tech sector, ranking #25 among the Top 100 Private Deep Tech Companies (source: factorialenergy.com).

Working There

Factorial Energy is actively hiring across various departments including R&D, manufacturing, sales, and engineering, particularly in response to their recent expansion efforts. The Methuen facility is expected to create over 150 jobs, contributing to the local economy while supporting the company's growth in solid-state battery production. The company culture emphasizes speed and innovation, with a focus on ethical governance and sustainability goals, including a commitment to carbon-neutral production by mid-2030 (source: factorialenergy.com).


Last updated on Feb 23, 2026 | Report an issue

Factorial Energy is a pioneering U.S.-based solid-state battery company driving the future of energy storage and electrification. Partnered with global leaders including Mercedes-Benz, Stellantis, Hyundai, and Kia, Factorial is at the forefront of developing next-generation e-mobility platforms for commercial, defense, and consumer applications-spanning electric vehicles (EVs), drones, eVTOL aircraft, power tools, marine systems, robotics, and more. The company has achieved multiple industry firsts, including being the first to power a demonstration vehicle with a global OEM (Mercedes- Benz), which achieved over 1,200 km (749 mi) of range, and the first to earn UN 38.3 certification for automotive-sized lithium-metal solid-state cells, and the first to deliver B-samples of automotive-sized solid-state batteries to major OEMs.

The Opportunity

We are seeking a motivated Cell Test Engineer with more than 4 years of experience in cell testing to support our rapidly growing solid-state battery development company. This role will be responsible for cell testing validation, protocol development, data processing and analysis. The ideal candidate will have experience in cell testing, and capable of interpreting test plans, and collaborating with the development team to complete cell qualifications.

Key Responsibilities

  • developing and optimizing the cell testing system, including processes, standards, specifications, use cases, DVP, report templates, etc.
  • coordinating with customers regarding testing standards, plans and schedules.
  • following up on cell testing, including conducting tests, analyzing results, resolving testing issues and supporting the cell development team in failure analysis.
  • organizing and analyzing cell data, reviewing test reports, establishing a cell database, and compiling automated data processing scripts.
  • tracking and interpreting international standards and regulations, and benchmarking against industry-leading testing standards
  • managing the testing laboratory and maintaining testing equipment, and planning annual testing requirements
  • Develop new testing schemes

Qualifications

  • Master's degree
  • More than four years of relevant experience in cell testing, be familiar with the cell performance testing process and methods, understand the testing standards and safety regulations.
  • Able to quickly understand various testing requirements and possess the ability to convert requirements and write test plans, and implement testing work.
  • Data analysis skills and be proficient in using data processing software to generate test reports.
  • Familiar with the operation and data management of cell testing equipment (such as Neware, etc.), and have equipment maintenance capabilities.
  • Have good teamwork and cross-departmental communication and cooperation skills, and be able to effectively communicate and cooperate with personnel from different departments to promote testing progress.
  • Understand the working principle of lithium batteries, the mechanism of degradation and influencing factors. Possess strong data analysis capabilities and safety awareness in cell testing, be meticulous and sensitive to data.
  • Fluent in English

What We Offer

  • Opportunity to work in a cutting-edge solid-state battery technology company
  • Collaborative and international working environment
  • Competitive compensation and career growth opportunities

Apply now

Job expired?

Please let Factorial Energy know you found this job on Rejobs. This will help us grow and get more people to work on renewable energy!

About the role

April 7, 2026

Full time

Company

April 7, 2026

On-site

Energy Storage

Factorial Energy

factorialenergy.com

  •  Cheonan, South Korea

More than 4 years

UTC+09:00