Battery Technician/Engineer

Rincell Corporation; Fremont (CA); On-site; USD 70,000 - 120,000; Full time

Job summary

Rincell Corporation in Fremont, CA is seeking a hands-on Battery Technician/Engineer to support cell development, manufacturing, testing, and troubleshooting across the end-to-end process.

You will work at the R&D and pilot-line facility, performing slurry mixing, electrode manufacturing, cell assembly, formation, and teardowns, while maintaining accurate records and collaborating with cross-functional teams.

Qualifications

• At least 2 years of hands-on experience with battery cells in manufacturing, development, or testing.
• Experience with battery cell manufacturing processes.
• Ability to follow detailed procedures and maintain accurate records.
• Strong troubleshooting, documentation, and communication skills.
• Experience with pilot-line equipment and battery materials handling.

Responsibilities

• Perform slurry mixing and materials preparation for battery electrodes.
• Support electrode manufacturing including coating, drying, calendaring, and slitting.
• Build battery cells and support cell assembly processes, equipment setup, and troubleshooting processes.
• Perform cell formation, aging, electrical testing, and performance characterization.
• Conduct cell teardowns and document observations, failure modes, and findings to support root-cause analysis.
• Maintain accurate manufacturing, test, and experimental records; summarize results and communicate issues to the team.
• Operate and maintain R&D and pilot-line equipment while following safety procedures and work instructions.
• Support process development, experiments, build plans, and troubleshooting with R&D and manufacturing teams.
• Assist with materials handling, inventory tracking, equipment readiness, and continuous improvement of cell manufacturing processes.

Skills

Hands-on battery cells

Troubleshooting

Documentation

Communication skills

Pilot-line experience

Tools

Cell testing instruments

Job description

Rincell is shipping the world's highest energy-performance Silicon-Graphite lithium-ion and Sodium-ion batteries for defense and commercial applications. With relentless innovation, we are redefining the next generation of energy storage solutions.

Role Overview

We are seeking a hands‑on Battery Technician / Engineer to support battery cell development, manufacturing, testing, and troubleshooting at Rincell's R&D and pilot-line facility. This role will work across end-to-end cell manufacturing process, from slurry mixing and electrode manufacturing through cell assembly, formation, testing, and cell teardowns. Prior hands‑on battery cell experience is required.

Key Responsibilities

Battery Cell Manufacturing:

• Perform slurry mixing and materials preparation for battery electrodes.
• Support electrode manufacturing, including coating, drying, calendaring, and slitting, as applicable.
• Build battery cells and support cell assembly processes, equipment setup, and troubleshooting processes.

Formation, Testing & Teardowns:

• Perform cell formation, aging, electrical testing, and performance characterization in accordance with established procedures.
• Conduct cell teardowns and document observations, failure modes, and findings to support root-cause analysis.
• Maintain accurate manufacturing, test, and experimental records; summarize results and communicate issues to the team.

Pilot Line, R&D & Quality Support:

• Operate and maintain R&D and pilot-line equipment while following safety procedures and work instructions.
• Support process development, experiments, build plans, and troubleshooting with R&D and manufacturing teams.
• Assist with materials handling, inventory tracking, equipment readiness, and continuous improvement of cell manufacturing processes.

Qualifications

• At least 2 years of hands‑on experience working with battery cells in cell manufacturing, development, or testing is required.
• Practical experience with battery cell manufacturing processes is required.
• Ability to follow detailed procedures, work safely with battery materials and equipment, and maintain accurate records.
• Strong troubleshooting, documentation, and communication skills.
• Experience with pilot-line equipment, cell testing instruments, and battery materials handling.

Preferred Skills

• Experience with lithium‑ion and/or sodium‑ion battery chemistries.
• Experience working in a startup, R&D, or fast‑paced manufacturing environment.

Why Join Us

• Be part of a fast‑growing company shaping the future of energy storage.
• Work on cutting-edge technologies with a direct path to real‑world deployment.
• Collaborate with a passionate team at the intersection of science, engineering, and manufacturing.