Flying time is much less than A3 DJI

I’m using firmware 4.0.3 copter,I found that our ardupilot controller will made the copter flying 10 minutes less than which is using A3 dji controller,i use the same full battery and 21.5v will triggerr RTL.DJI A3 controller will make the copter fly more than 30 minutes.

Calibrate your power module!

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Tuning is critical, wrong PIDs and some parameters can cause motors to use excessive power.
https://ardupilot.org/copter/docs/tuning-process-instructions.html
and


and in MissionPlanner you can press ALT A to generate these initial params