Position Title: Battery Test and Diagnostics EngineerDuration: Contract Location: Banbury, Oxfordshire. Our Client is seeking a technically capable Battery Test and Diagnostics Engineer to support high-voltage battery and power-system commissioning, diagnostics, validation and engineering fault resolution.This hands-on role supports prototype and production build phases, with PEOL/EOL testing providing the environment for proactive engineering investigation rather than routine test execution alone.The engineer will independently isolate complex failures, test engineering hypotheses and drive corrective action across battery hardware, BMS, electrical interfaces and test systems. Key Responsibilities: Diagnose HV battery pack, BMS and power-system faults covering contactors, pre-charge circuits, HVIL, insulation monitoring, voltage/current sensing, thermal management and control interfaces.Interpret electrical schematics, CAN/XCP logs, diagnostic codes, oscilloscope traces and DAQ measurements to isolate hardware, software, calibration, network or test-equipment faults.Own systematic fault investigations from symptom reproduction and hypothesis development through root cause confirmation, corrective action and verification of resolution.Apply structured RCA methods including 5 Whys, 8D and fault-tree analysis; investigate intermittent, repeatable and operating-condition-dependent failures.Develop and perform controlled fault-injection and abnormal-condition tests to verify ..... full job details .....