Start with the mission
Define the flight duration, payload, operating environment and reserve policy before comparing cells. A headline energy-density value cannot determine endurance on its own; the aircraft, propulsion system, pack design and mission profile all matter.
Balance energy and power
List the continuous and peak current requirements alongside the target energy. Discharge capability, thermal limits and voltage behavior should be reviewed against the complete duty cycle and the current product datasheet.
Move from cell to pack
Cell dimensions and mass are only one part of integration. Configuration, interconnects, BMS, structure, cooling and mounting influence pack-level mass and usable energy. Validate the assembled system in the intended platform.