# Power setup

Open the *Vehicle Setup* tab and select the *Power* menu.

## Calibrating the power sensor

> **Note** Power sensor calibration should be done with the battery pack connected to the drone.

1. Set the *Number of cells* parameter according to the number of cells in your battery (*3* for the Clever 4 drone).
2. Calculate the voltage divider:
    * Measure voltage across the battery (you may use a battery voltage tester for that).
    * Press the *Calculate* button next to the *Voltage divider* label.
    * Put the battery voltage into the prompt and click *Calculate*.
    * Press *Close* to save the calculated value.

<img src="../assets/qgc-battery.png" class="zoom">

Further reading: https://docs.qgroundcontrol.com/en/SetupView/Power.html.

## ESC calibration

> **Warning** **Never attempt ESC calibration with propellers on!** In some cases the motors will start spinning with maximum speed.

1. Make sure the battery is disconnected and the propellers are not mounted.
2. Press *Calibrate*.
3. Connect the battery when prompted.
4. Wait for the *Calibration complete*.

<img src="../assets/qgc-esc.png" class="zoom">

Further reading: https://docs.px4.io/v1.9.0/en/advanced_config/esc_calibration.html.