AirPods Pro (Any Generation) beeping sound while charging on the Fuel.

On the fuel Power Stations - while Charging your AirPods Pro, as the charge reaches 80-100%, the unit will stop requesting power from the Fuel.  As it does this, it turns the AirPods Pro on and off.   This is normal behavior.  It may stop asking for charge - then turn back on again asking for charge throughout the night, or during the time it is on the charging station.   The sound is coming form the AirPods Pro- connecting and disconnecting.    Users can disable the charging sounds.  Here is an Apple Support article.

 

https://support.apple.com/en-nz/guide/airpods/dev6cbd13615/web#:~:text=You%20can%20turn%20off%20these,Case%20Sounds%20on%20or%20off.