BEI Maximus UL 20A Battery | 95S4P 366.7V 84.4Ah High-Energy Battery Pack

The BEI Maximus UL 20A 95S4P Battery Pack is an ultra-high-energy, high-voltage battery system designed for advanced aerospace platforms, electric aircraft, UAVs, robotics, and other weight-critical applications requiring substantial energy storage with high specific energy. Built using 380 BEI Maximus UL 20A lithium-metal cells, the 95S4P architecture provides a 366.7 V nominal system voltage, up to 84.4 Ah typical capacity, and approximately 30.95 kWh of typical stored energy. Cell Datasheet BEI’s Maximus UL 20A cell provides a 519 Wh/kg cell-level gravimetric energy density, alongside high discharge capability and operation at temperatures down to −35°C. BEI Maximus UL 20A Datasheet.pdf Technical Specifications Configuration: 95S4P Cell Count: 380 Nominal Voltage: 366.7 V Maximum Charge Voltage: 408.5 V Discharge Cutoff Voltage: 285.0 V Capacity Typical: 84.4 Ah @ 0.1C Minimum: 80.0 Ah @ 0.1C Rated: 78.4 Ah @ 1C Energy Typical: 30.95 kWh @ 0.1C Minimum: 29.34 kWh @ 0.1C Rated: 28.58 kWh @ 1C Charge Current Standard: 16 A (0.2C) Maximum: 80 A (1C) Discharge Current Standard: 80 A (1C) Maximum Continuous: 400 A (5C) Maximum Continuous @ −20°C: 640 A (8C) Maximum Discharge ≤300 sec: 800 A (10C) Maximum Pulse ≤10 sec: TBD by BEI Final pack-level current capability is dependent on busbar design, interconnects, thermal management, BMS architecture, contactors, cabling, connectors, and overall system design. Internal Resistance Cell ACIR: ≤1.6 mΩ @ 1 kHz, 30% SOC Cell DCIR: ≤4.0 mΩ @ 30% SOC Pack-level resistance is dependent on the complete electrical architecture and interconnection system. Environmental Specifications Charge Temperature: +10°C to +45°C Discharge Temperature: −35°C to +71°C Storage Temperature: 0°C to +45°C Maximum Cell Body Temperature: 90°C Mechanical Specifications Cell Weight: 157 g each Cell-Level Mass (380 cells): ~59.66 kg Finished Pack Weight: Dependent on mechanical structure, BMS, busbars, contactors, wiring, thermal management, and enclosure requirements. Cell Performance Cell-Level Gravimetric Energy Density: 519 Wh/kg @ 0.1C Cell-Level Volumetric Energy Density: 1,282 Wh/L @ 0.1C Cycle Life: 70 cycles — 0.2C charge / 1C discharge, 100% DOD to 80% SOH 30 cycles — 1C charge / 2C discharge, 100% DOD to 80% SOH Cell Certification: UN 38.3 BEI Maximus UL 20A Datasheet.pdf Availability Lead Time: Approximately 3 weeks BEI Maximus UL 20A cells are currently intended for testing and evaluation applications, with availability subject to supply. High-voltage systems can be engineered with custom mechanical architecture, BMS integration, contactors, service disconnects, communication interfaces, thermal management, and application-specific electrical integration. For full technical documentation, integration support, or custom high-voltage battery configurations, please contact our team.