At WHOOP, we're on a mission to unlock human performance and healthspan. WHOOP empowers members to perform at a higher level through a deeper understanding of their bodies and daily lives.
As a Battery Engineer II at WHOOP, you will help ensure the quality, reliability, and performance of the batteries that power our products. Working closely with cross-functional engineering teams, suppliers, and third-party testing labs, you will support the validation and development of next-generation battery systems through testing, failure analysis, supplier qualification, regulatory compliance, and continuous design improvement. You will contribute to advancing battery technology by improving validation processes, testing standards, and technical documentation across the product development lifecycle. This is a hands-on role with the opportunity to drive meaningful impact through experimentation, analysis, and collaboration.
RESPONSIBILTIES:
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%)
QUALIFICATIONS:
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 Required
- BS with 2+ years experience or MS with 1+ years experience in battery systems
- Experience in lithium-ion battery development, testing, validation, or related academic research
- Designing, modeling, and validating rechargeable battery systems
- Strong understanding of lithium-ion cell design, battery chemistry, battery testing standards, safety guidelines, and lab instrumentation
- Experience with regulatory certification activities (UL, CE, IEC), DFMEA, risk assessments, root cause analysis, and failure investigation
- Experience writing technical reports and documenting test plans, quality findings, supplier assessments, and test evaluations
- Understanding of tolerance stack analysis, mechanical GD&T, and measurement methods
- Familiarity with Python or similar tools for data visualization, analysis, and automation
- Strong communication skills for technical topics in cross-functional settings
- Willingness to travel to supplier sites (up to 15%) and participate in supplier audits and design reviews
- Ability and willingness to relocate and work out of the Boston, MA office
- Awareness of emerging battery technologies, materials, and market trends
- Commitment to embracing and leveraging AI tools in day-to-day tasks
What the Team is Saying
.jpg)
.jpg)
WHOOP Compensation & Benefits Highlights
-
Wellbeing & Lifestyle Benefits — Wellness support includes a stipend and a complimentary WHOOP membership to use and gift, aligning perks with the company’s health focus. Feedback suggests these lifestyle benefits are a meaningful part of total rewards.
-
Healthcare Strength — Core coverage spans medical, dental, vision, mental health services, and life and disability insurance. This breadth indicates a comprehensive health safety net.
-
Equity Value & Accessibility — Total rewards commonly include stock options or equity participation, positioning ownership as part of compensation. Feedback suggests equity is viewed as a valuable component of the package.
WHOOP Insights
What We Do
At WHOOP, we’re on a mission to unlock human performance. WHOOP empowers members to perform at a higher level through a deeper understanding of their bodies and daily lives. Our wearable device and performance optimization platform has been adopted by many of the world's greatest athletes and consumers alike.
Why Work With Us
At WHOOP, we’re focused on building an inclusive and equitable team with a strong sense of belonging for everyone—increasing representation in every way as our team grows. We believe that our differences are our source of strength—so much so it’s one of our core values.
Gallery
WHOOP Offices
Hybrid Workspace
Employees engage in a combination of remote and on-site work.
