Your CharterGenerate the data that drives battery performance, reliability, and safety.
You will design and execute battery testing programs that characterize cells, modules, packs, and complete robotic battery systems under realistic operating conditions. Your work will provide the foundation for battery algorithms, hardware validation, fleet analysis, and long-term reliability improvements.
As a Battery Test Engineer, you will play a critical role in understanding how batteries behave in the real world and ensuring our energy systems meet the demands of humanoid robotics.
Key Outcomes- Develop and execute battery test campaigns that generate high-quality data for performance, aging, safety, and reliability analysis
- Create robotic duty-cycle test profiles that accurately represent real-world operating conditions, including transient loads, regenerative events, and continuous operation
- Identify battery degradation mechanisms, failure modes, and performance limitations through structured testing and analysis
- Support validation of battery management systems, including SoC, SoH, fault detection, and protection strategies
- Deliver actionable insights and recommendations that improve battery design, algorithms, safety, and field performance
Key Competencies- Strong understanding of lithium-ion battery behavior, degradation mechanisms, and safety considerations
- Hands-on laboratory experience with battery testing equipment and experimental validation methods
- Strong analytical mindset with the ability to extract meaningful insights from large datasets
- Excellent troubleshooting and root-cause analysis skills
- Strong communication and documentation skills that support cross-functional engineering collaboration
Minimum Requirements- BS or MS in Electrical Engineering, Mechanical Engineering, Energy Systems, or a related field
- 2+ years of experience in battery testing, validation, reliability engineering, or a related field
- Hands-on experience working with lithium-ion cells, modules, or battery packs
- Experience operating battery cyclers, environmental chambers, and laboratory test equipment
- Experience analyzing test data using Python, MATLAB, or similar technical computing tools
- Comfortable working in laboratory environments and following rigorous safety procedures
Preferred Skills- Experience testing batteries for robotics, automotive, aerospace, industrial equipment, or other high-reliability systems
- Familiarity with battery management systems (BMS), SoC/SoH estimation, and battery algorithms
- Experience developing automated test systems and scripting test workflows
- Familiarity with battery safety and certification standards such as UN38.3, IEC 62133, UL, or ISO 26262
- Experience with environmental, thermal, vibration, abuse, or durability testing
- Experience analyzing field data and supporting fleet-level reliability investigations
What does a successful 1X Team Member look like?Team members at 1X who thrive here are builders. They move fast, own their work completely, and treat time like it's the one thing you can't get back - because it is. They say what they mean, finish what they start, and hold themselves to a standard before anyone has to ask. We push each other to be better, and we do it with honesty and respect.
Successful Battery Test Engineers at 1X are deeply curious about how systems behave in the real world. They combine rigorous experimental methods with practical engineering judgment, moving quickly from questions to data to decisions. They care about safety, reliability, and creating the insights that allow better products to be built.
Compensation Range$106,400 - $146,300 + Equity
Benefits- Comprehensive medical, dental, and vision coverage
- Generous paid time off, company holidays, and parental leave
- 401(k) plan with company match (100% on the first 3% of contributions, 50% on the next 2%)
- Flexible Spending Accounts (FSA) and Health Savings Accounts (HSA) options
- Commuter benefits (transit and parking)
- Short-term and long-term disability, and life insurance
- Employee Assistance Program (EAP) for mental health, financial, and personal support
- Onsite snacks and catered lunches
