# Battery Engineer II

**Company:** [WHOOP](https://hotfix.jobs/companies/whoop)
**Location:** Boston, MA
**Role:** Hardware Engineering
**Experience:** 2+ years
**Skills:** Lithium-Ion Battery Development, Battery Testing And Validation, Battery Chemistry, Battery Testing Standards, Python, GD&T, Tolerance Stack Analysis, Dfmea, Failure Analysis
**Posted:** 2026-06-17

> 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.

## Job Description

## 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

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