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WHOOP

Battery Engineer II

Boston, MAHardware EngineeringOnsite2+ YOE
Summary

Hands-on Battery Engineer II role focused on developing, testing, and validating lithium-ion battery systems for wearable products. Requires 2+ years experience and strong technical documentation and cross-functional collaboration skills.

About the role

Responsibilities

  • Develop, execute, and document battery pack, system, and component-level test plans for design validation, qualification, performance, durability, and safety across NPI programs and internal evaluations
  • Collaborate with multidisciplinary engineering teams and suppliers across the globe to translate system and cell-level safety and performance requirements into functional battery pack architectures
  • Support regulatory certification activities (e.g., UL, CE, IEC), internal safety audits, DFMEA, risk assessments, root cause analysis, and failure investigation workflows
  • Manage testing, review supplier test reports, and support verification and validation for new projects, suppliers, and alternate battery technologies
  • Evaluate lithium-ion batteries across different designs, use cases, and WHOOP product conditions to assess performance, safety, longevity, and manufacturability
  • Travel to supplier sites as needed for line audits, design reviews, builds, and joint problem-solving (up to 15%)

Requirements

  • BS with 2+ years of experience in battery systems, or MS with 1+ years experience
  • Experience in lithium-ion battery development, testing, validation, or related academic research along with designing, modelling and validating rechargeable battery systems
  • Strong understanding of lithium-ion cell design, battery chemistry, battery testing standards, safety guidelines, and lab instrumentation
  • Experience writing technical reports and documenting test plans, quality findings, supplier assessments, regulatory compliance activities, and test evaluations
  • Strong communication skills for battery-related technical topics clearly in cross-functional settings
  • Understanding of tolerance stack analysis, mechanical GD&T, and measurement methods
  • Familiarity with Python or similar tools for data visualization, analysis, and automation
  • Awareness of emerging battery technologies, materials, and market trends
  • Strong commitment to embracing and leveraging AI tools in day-to-day tasks, ensuring AI-assisted work aligns with the same high-quality standards as personal contributions
Skills
Lithium-ion battery developmentBattery testing and validationBattery chemistryBattery testing standardsPythonGD&TTolerance stack analysisDFMEARegulatory compliance (UL, CE, IEC)Failure analysis
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