Service function guideHybrid Battery Health Check

This guide equips professional technicians and advanced DIYers with a structured method for performing a hybrid battery health check by reading block voltages, interpreting the data, and making a informed judgment on pack condition. It covers the theory of nickel-metal hydride and lithium-ion packs, the situations that demand a voltage audit, and the preparation required to work safely around high-voltage systems. The step-by-step procedure walks through accessing block voltage data with a scan tool or dedicated battery tester, recording values under load, and analyzing imbalances that indicate degradation. Readers will finish with the ability to distinguish normal variation from a failing module, document their findings, and recommend the appropriate next step for the vehicle.