Sr. Battery Engineer

The Role

We're looking for a Battery Engineer to own the design, development, integration, and qualification of our spacecraft battery systems. You'll be responsible for developing reliable, high-performance energy storage solutions that power the spacecraft through eclipse periods, peak load events, and critical mission operations.

We're looking for a Battery Engineer to own the design, development, integration, and qualification of our spacecraft battery systems. You'll be responsible for developing reliable, high-performance energy storage solutions that power the spacecraft through eclipse periods, peak load events, and critical mission operations. This is a hands-on individual contributor role for an engineer who enjoys taking battery systems from concept through flight.

You'll work closely with power electronics, avionics, thermal, mechanical, and software engineers to develop flight-ready battery hardware capable of operating safely and reliably in the harsh environment of space.

• Own the architecture and development of spacecraft batteries from concept through flight qualification
• Design battery packs, module architectures, and electrical interconnects (e.g., laser welding, wire bonding, busbar design) to meet mission performance requirements, including series/parallel cell configuration trade-offs
• Develop a battery management system (BMS), including cell balancing (passive and active balancing techniques), state-of-charge (SOC) and state-of-health (SOH) estimation (coulomb counting, OCV-based, and model-based/Kalman filtering approaches), fault detection, and protection strategies (overvoltage, under voltage, overcurrent, over temperature, cell imbalance)
• Select battery cell chemistries and components (e.g., NMC, NCA, LFP, or primary Li-CFx for long-duration/low-power missions) based on mission requirements, specific energy/power trade-offs, cycle life, reliability, and environmental constraints
• Perform battery sizing, capacity analysis, degradation modeling (capacity fade, impedance growth), depth-of-discharge (DoD) management for cycle life targets, and lifecycle assessments
• Develop battery charging and discharge strategies in partnership with the spacecraft power systems team, including coordination with solar array power management (MPPT vs. direct energy transfer) and peak-load discharge current limiting
• Define thermal management requirements and collaborate with thermal engineers to ensure safe battery operation, including thermal runaway propagation mitigation (cell-to-cell spacing, thermal barriers, venting design) and cold-survival heater strategy
• Lead battery integration, validation, environmental qualification, and acceptance testing, including vibration/shock (per GEVS/NASA-STD-7001 or ECSS equivalents), thermal vacuum cycling (TVAC), vacuum out gassing (ASTM E595), and abuse testing (overcharge, short circuit, crush, penetration, thermal abuse)
• Investigate battery performance, reliability, and failure modes through analysis and testing, including root-cause failure analysis and corrective action development
• Support manufacturing, supplier selection, DFM/DFT reviews, cell matching/sorting processes, weld quality inspection (including X-ray/CT inspection for internal defects), and production readiness
• Support spacecraft integration, launch campaigns, and on-orbit battery performance monitoring and trending

• BS, MS, or PhD in Electrical Engineering, Mechanical Engineering, Materials Science, Chemical Engineering, or a related discipline
• 3+ years developing battery systems for aerospace, automotive, defense, or other high-reliability applications
• Experience designing battery packs and energy storage systems, including cell/module/pack architecture and electrical interconnect design
• Knowledge of lithium-ion battery chemistry (NMC, NCA, LFP), degradation mechanisms, and safety considerations
• Experience developing or integrating Battery Management Systems (BMS), including cell balancing, SOC/SOH estimation, and fault protection architectures
• Experience with battery testing, characterization, and validation, including cycle life testing, performance…