Meaning
Regulatory testing criteria specify required re-evaluation conditions for lithium cell and battery designs undergoing physical modifications or specification changes. The UN Manual of Tests and Criteria defines sub-section 38.3.2.2 retesting to mandate specific safety tests when mass, voltage or structural changes alter transport safety profiles. The scope covers mandatory re-qualification testing for previously certified lithium batteries subject to design changes.
It stops where design changes fall below defined modification thresholds or where initial compliance certification is performed for new designs.
Modification Threshold
Design changes exceeding a twenty percent increase in mass or a twenty percent change in open-circuit voltage trigger formal re-evaluation requirements. Performing sub-section 38.3.2.2 retesting ensures that modified battery assemblies maintain structural stability under transport stresses. Cathode material alterations or active material mass changes also require formal regulatory review before commercial transport approval.
Test Selection
Mandatory test sequences depend on whether modifications affect single cell units or multi-cell battery packs. Short circuit and altitude simulation tests are repeated when safety-critical circuit component substitutions occur.
Compliance Documentation
Certified test reports document compliance across vibration, shock, external short circuit and thermal testing protocols following design updates. Shipping non-compliant lithium batteries without updated testing documentation invalidates transport authority approvals and exposes manufacturers to severe civil penalties. Standardized test summaries must accompany commercial shipments to verify regulatory compliance across global supply chains.
