Xbox controller bottom expansion port specs?

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The Xbox controller's bottom expansion port, not provide a dedicated power output. It is primarily designed for communication purposes and does not supply power to external devices.

If you are looking to draw power from an Xbox controller, your best option would be to utilize the micro-USB port located on the top of the controller. The micro-USB port can provide power when the controller is connected to a compatible power source such as a computer or a USB wall adapter.

Please note that the power output of the micro-USB port may vary depending on the specific Xbox controller model. However, it is generally safe to assume a maximum current of 500 mA (milliamperes) at 5 volts, which is the standard USB 2.0 specification.

I don't know what was the question that still remained, but the port you want to use is not for power supply.

• Disconnect the headset or unplug the headset cable from the bottom of the controller, and then reconnect it firmly to the controller (in the expansion port for a headset or the 3.5-mm port for a 3.5-mm chat headset).

• Make sure the headset is not muted. To do this, check the mute button on the headset controls. (For a headset, the mute button is on the left side of the connector that is plugged into the expansion port of the controller. For a 3.5-mm chat headset, the
  mute button is a slider button on the front of the audio controls that are in the middle of the headset cable.)

Yes, the headset adapter is compatible with all xbox one controller including your elite controller series one

"No matter what kind of Xbox controller you have, you can connect the Xbox One Stereo Headset Adapter to your controller by plugging it into the rectangular expansion port on the bottom of
your controller"

For the Xbox 360 the port on the bottom of the controller for the headsets is a 2.5MM female.