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# Battery Test & Diagnostics Engineer

- **Company:** Contechs Consulting Limited
- **Location:** Banbury, United Kingdom
- **Contract:** Permanent contract
- **Skills:** Systems Engineering, Code Coverage, Failure Mode Effects Analysis, Hardware Design, Python (Programming Language), LabVIEW, MATLAB, Systems Architecture, Test Data, Test Execution Engine, Diagnostic Tools, Test Scripts, Canoe Software
- **Published:** October 30, 2026
- **Apply:** https://www.cv-library.co.uk/job/225778464/Battery-Test-Diagnostics-Engineer

## About the Role

* Strong hands-on engineering experience with HV battery packs, battery management systems or closely related EV energy-storage and power systems.
 * Proven ability to independently fault-find complex electrical, electronic and system-level issues and deliver evidence-based root cause analysis.
 * Sound understanding of battery pack architecture, contactors, pre-charge, HVIL, insulation monitoring, sensors and BMS fault/protection strategies.
 * Practical experience in fault injection, diagnostic validation, abnormal-condition testing or equivalent controlled fault simulation.
 * Competence interpreting wiring diagrams, electrical schematics, system architectures, CAN signals and diagnostic data.
 * Experience using oscilloscopes, multimeters, DAQ systems and CAN/XCP tools such as Vector CANoe, CANalyzer or CANape.
 * Ability to analyse data, develop diagnostic hypotheses, challenge test outcomes and independently drive technical problems to closure.
 * Formal HV training, safe-isolation competence and disciplined adherence to HV safety procedures and risk controls.
 * Degree, HND or equivalent relevant experience in Electrical, Electronic, Automotive, Mechatronics or Systems Engineering.

Tools & Knowledge (Desirable):

 * Lithium-ion battery module/pack validation, thermal management and BMS calibration experience.
 * PEOL/EOL test development and engineering support in prototype, low-volume or production EV environments.
 * Test scripting and automation using Python, MATLAB, LabVIEW or similar tools.
 * Knowledge of DFMEA, DVP&R, fault coverage, diagnostic thresholds and software/hardware integration.

Candidate Profile:

 * A proactive, technically inquisitive engineer who does not stop when an EOL test reports a failure.
 * The successful candidate can explain why the system failed, safely reproduce and isolate the issue, establish the root cause and drive an effective engineering resolution.

## Description

* Our Client is seeking a technically capable Battery Test & 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., * 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 BMS diagnostics, fault detection thresholds, protective actions, interlocks and recovery behaviour.
 * Use approved risk assessments, authorised equipment and safe test methods for all HV and fault-injection activities.
 * Execute and technically assess PEOL/EOL commissioning and performance tests; investigate failed results rather than simply repeat or reset test sequences.
 * Distinguish genuine product failures from false failures, test-rig limitations, incorrect limits, communications faults and calibration issues.
 * Analyse trends in test data, identify recurring defects and recommend improvements to test coverage, test limits, diagnostic methods and production robustness.
 * Develop or adapt diagnostic routines, test scripts, data acquisition and engineering test procedures to support investigation and validation.
 * Work with battery design, BMS software, validation and manufacturing engineering teams to agree engineering fixes and verify their effectiveness.
 * Produce clear test evidence, technical investigation reports, root-cause findings and practical recommendations; proactively escalate safety or delivery risks.