Power usage during a firefight is linear until you hit an overload threshold, so calculate average draw per weapon and armor, then multiply by expected combat time. Keep the loadout balanced: don't stack the heavy cannon if you only need medium firepower, the extra power drain isn’t worth the marginal damage. Use a simple spreadsheet: columns for weapon, power draw, heat, damage; rows for time intervals. Then compare total energy consumption against battery capacity plus regeneration. The loadout with the lowest power-to-damage ratio will give you the best endurance. Adjust for heat sinks and coolant, because overheat can kill you faster than power loss. Remember, precision matters—every kilowatt counts.