21700 5s battery pack shell

For the 5 inch drone, the most optimal version of the 21700 battery is 5s. With a capacity of 3100mAh, the flight time is 10 minutes. 4s version: flight time is 8 minutes and there is a lack of thrust. 6s version: flight time is 10 minutes, but there is a lot of inertia. The weight of my batteries: 370g. Measurements were taken with an additional load of 120 grams.