Battery Test Engineer

About this role

1X is seeking a Battery Test Engineer to design and execute comprehensive testing programs for lithium-ion battery systems powering their humanoid robot NEO. You'll generate critical performance and reliability data that drives battery algorithms, validation, and real-world operational improvements for a robot designed to safely operate in home environments.

What you'll do

• Design and execute battery testing campaigns across cells, modules, packs, and complete robotic systems under realistic operating conditions
• Create robotic duty-cycle test profiles that simulate real-world 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 state-of-charge, state-of-health, fault detection, and protection strategies
• Analyze large datasets to extract actionable insights and deliver recommendations for battery design and algorithm improvements
• Collaborate cross-functionally with hardware, firmware, controls, and fleet operations teams

What they're looking for

• Lithium-ion battery behavior and degradation mechanisms
• Battery testing equipment operation (cyclers, environmental chambers)
• Data analysis using Python, MATLAB, or similar technical computing tools
• Root-cause analysis and troubleshooting
• Laboratory experimental validation methods
• Battery management systems and SoC/SoH estimation
• Technical documentation and cross-functional communication
• Automated test systems and test workflow scripting