Our client, a privately owned UK-based company specialising in the development of Nickel Zinc battery technology is currently looking to hire a Senior / Principal Battery Test Engineer. The successful candidate will lead and manage UK-based testing and evaluation initiatives for advanced submarine battery systems. The Senior / Principal Battery Test Engineer will: * Apply deep understanding of battery system design, electrochemistry, and integrated safety features to inform test objectives and interpret results. * Develop, review, and approve detailed test documentation including Test Plans, Procedures, and Reports for battery modules, packs, and system-level evaluations. * Manage hazard and risk assessments associated with lithium-ion battery handling, testing, and fault simulation. * Coordinate thermal runaway, short circuit, and mechanical abuse tests in compliance with relevant Defence and maritime standards. * Support the generation of business cases, technical input for RFQs, and proposals for new battery testing initiatives. * Collaborate with engineering peers, partners, and test facility personnel to align testing scope with project requirements and safety considerations. The Senior / Principal Battery Test Engineer will have: * Bachelor’s degree in Engineering (Electronics, Electrical, Mechanical, Systems, or related discipline). * In-depth knowledge and hands-on experience with battery technologies, particularly lithium-ion, for high-integrity systems. * Proven capability in battery system test planning, execution, and reporting across development and qualification stages. * Familiarity with Systems Engineering (SE) and V&V processes. * Strong communication and leadership skills; ability to mentor junior engineers. If you are interested in this exciting opportunity, simply apply online by submitting a copy of your up-to-date CV and we will be in touch