Cell Test Engineer

Factorial Energy is seeking a Cell Test Engineer to join our team in Cheonan, South Korea. This is an entry-level, hands-on role responsible for keeping our internal cell test lab running day to day: operating and maintaining test equipment, putting cells on test, and translating cell owners' requirements into test protocols. It is an excellent opportunity for a recent graduate to build a foundation in lithium-metal and solid-state battery testing alongside an experienced development team.

About Factorial Energy

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.

Responsibilities

• Operate the internal cell test lab day to day, including loading and unloading cells, setting up fixtures, and starting, monitoring, and closing out tests
• Perform routine checks, calibration, and basic maintenance of test equipment (cyclers, environmental chambers, EIS, etc.), troubleshoot issues, and coordinate repairs with vendors
• Write test protocols and cycler schedules based on requirements from cell owners, and confirm test conditions before launch
• Track test status, channel and chamber utilization, and schedules, and promptly communicate progress and anomalies to cell owners
• Maintain accurate test records and sample tracking, and ensure test data is uploaded to the cell database
• Follow and help enforce lab safety procedures, including handling of lithium-metal cells, response to abnormal cells, and hazardous waste disposal
• Coordinate with external test labs for UN 38.3 and safety/abuse testing, including sample preparation, shipping documentation, scheduling, and report follow-up
• Support basic data processing and test summary reports as needed

Requirements

• Bachelor's degree in Electrical, Chemical, Mechanical, or Materials Engineering, Chemistry, or a related field
• 0–2 years of experience; internship or academic lab experience with batteries or electrochemical testing is a plus
• Basic understanding of how lithium batteries work (charge/discharge, capacity, C-rate, SOC)
• Hands-on and detail-oriented, comfortable with routine lab work and test equipment

Strong safety awareness and discipline in following procedures

• Proficient in Excel; familiarity with battery cyclers (e.g., Neware, Maccor, Arbin) or Python is a plus
• Good communication and teamwork skills, able to work effectively with cell owners and external labs
• Fluent in English (written and spoken), basic Chinese communication capability is preferred.

Work Location

Cheonan, South Korea

• Factorial Energy is an equal opportunity employer that values diversity at all levels. All qualified applicants, regardless of personal characteristics, are encouraged to apply.
• To request a reasonable accommodation to complete an application, job interview, and/or to otherwise participate in the hiring process, please contact ( [email protected]