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Hi @AmateurHour,
The buzzer you mentioned is equipped with OpenCR, the main controller of TurtleBot3. OpenCR checks the voltage of the battery and when the voltage is below 11V, the buzzer sounds. If you do not want to use it, you can modify the turtlebot3_diagnosis.cpp part of OpenCR. The related code is the link below.
https://github.com/ROBOTIS-GIT/OpenCR/blob/df6f6dcfacc6f400083210495a8f944728bf70d6/arduino/opencr_arduino/opencr/libraries/turtlebot3/src/turtlebot3/turtlebot3_diagnosis.cpp#L259-L288
Please refer to the link below for the information needed for this modification. :)
Setting the Arduino IDE for OpenCR http://emanual.robotis.com/docs/en/platform/turtlebot3/opencr_setup/#arduino-ide
How to modify ROS library code (OpenCR) http://emanual.robotis.com/docs/en/platform/turtlebot3/appendix_opencr1_0/#how-to-modify-ros-library-code
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