Good you got it figured out. The throttle calibration is something that should be done right after binding with any and all electric planes. To do this, it is necessary to plug both batteries in at the same time, so help is needed here as well.
To do T. Calibration ................................. TX on. Throttle stick to full throttle, throttle cut NOT activated, plug in both batteries at exactly the same time. Listen for the first beep tones, then immediately lower the throttle stick to the bottom. You should then get the usual start up tones and the cell count beeps. You're now done and you don't ever need to do this again until you change RX and/or TX. This is how the ESCs know what zero throttle is and what 100% throttle is and for a multi, this is how the motors sync to each other and run the same. For planes that you've never done this, even though the ESC/motor seems to run and even though your TX monitor tells you that the throttle goes from 0 - 100%, the ESC doesn't actually know this. As an example, your ESC may actually be going from -5% to 90%. This does not optimize your throttle reaction.
To do T. Calibration ................................. TX on. Throttle stick to full throttle, throttle cut NOT activated, plug in both batteries at exactly the same time. Listen for the first beep tones, then immediately lower the throttle stick to the bottom. You should then get the usual start up tones and the cell count beeps. You're now done and you don't ever need to do this again until you change RX and/or TX. This is how the ESCs know what zero throttle is and what 100% throttle is and for a multi, this is how the motors sync to each other and run the same. For planes that you've never done this, even though the ESC/motor seems to run and even though your TX monitor tells you that the throttle goes from 0 - 100%, the ESC doesn't actually know this. As an example, your ESC may actually be going from -5% to 90%. This does not optimize your throttle reaction.
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