Second-Life Battery Testing

As global demand for energy storage systems (ESS) and electric vehicle (EV) batteries continues to rise, so does the need for safe, reliable, and sustainable second-life solutions. Whether you’re repurposing used batteries for new applications, remanufacturing systems for extended use, or reintroducing refurbished products to the market, Intertek provides comprehensive testing, certification, and evaluation services to help you demonstrate compliance, performance, and safety.

Intertek partners with manufacturers at every stage of the battery second-life cycle — from performance validation and safety testing to certification and labeling.

UL 1974 Certification for Battery Repurpose and Remanufacturing

The UL 1974 Standard for Evaluation for Repurposing Batteries is the industry benchmark for verifying the safety and performance of remanufactured or repurposed energy storage products. UL 1974 certification helps manufacturers and recyclers build confidence in second-life energy storage, reduce risks, and support the circular economy.

UL 1974 Evaluation

Intertek experts guide you through a structured process designed to ensure second-life batteries deliver reliable performance:

• Sorting & Grading
• Electrical & Performance Testing
• Safety Testing
• BMS Validation
• Diagnostics & Maintenance

Labeling & Documentation

Certified products must be marked as “Repurposed” or “Remanufactured”, with UL 1974 certification details, chemistry, ratings, date codes, and traceable maintenance instructions.

Batteries: Repurpose, Rebuild, and Remanufacture Certification | Fact Sheet

As demand for sustainable energy storage grows, repurposing and remanufacturing lithium-ion batteries has become vital to reducing waste and extending product life.

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ETL Refurbishment Program for Safety Re-Certification

A refurbished product may need to be re-certified to its original safety standard rather than evaluated under UL 1974. Through The ETL Refurbishment program, products that have undergone refurbishment can be tested and re-certified to the same safety standard they were originally evaluated against, such as:

• UL 1973 – Batteries for use in stationary and motive applications
• UL 9540 – Energy Storage Systems (ESS)
• UL 1741 – Inverters, converters, and controllers for power distribution

Benefits of ETL Refurbishment Certification

• Maintain compliance to the original safety standard
• Re-establish ETL certification after refurbishment or modification
• Reduce costs and market delays by avoiding full re-design certification
• Ensure continued safety, performance, and regulatory acceptance

Why Choose Intertek for Battery Testing?

Intertek offers a flexible and comprehensive approach to battery testing and certification, helping manufacturers confidently navigate the transition to second-life applications. Whether pursuing UL 1974 certification for repurposed batteries or ETL Refurbishment Certification, our experts provide tailored pathways to meet your specific needs. With decades of global leadership in energy storage systems, EV batteries, inverters, and related technologies, Intertek’s accredited laboratories across North America and worldwide deliver trusted testing backed by deep technical expertise.

As a sustainability leader, we support manufacturers in extending product life, reducing waste, and advancing the circular economy. Partner with Intertek to ensure your second-life battery solutions are safe, compliant, and ready for market.