Vendor due diligence should focus on verifiable data and operational rigor:
- Documentation:
- Valid UL/UN certificates with traceable file numbers.
- Detailed datasheets specifying test conditions (temperature, C-rate).
- Cell traceability (lot numbers) and quality certifications (ISO 9001/IATF 16949).
- Factory Audits:
- Process controls for cell binning (capacity/IR variance ≤2%).
- Pilot-run samples tested for capacity retention and aging.
- Third-Party Validation:
- Independent lab reports (e.g., Intertek, TÜV) for cycle life and safety.
- Field data from deployed systems in similar U.S. applications.
- Commercial Terms:
- Warranty clarity (cycle/calendar life, temperature windows).
- Liability coverage and recall processes.
- Change-control policies for component substitutions.
Red flags include vague ‘Grade A’ claims without test data or incomplete UL scope listings.
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