Looks light it jus needs some mini spade terminals to connect however the only setup I've personally seen and handled built like that was a G&G one where it also went through an ETU, however you don't have a data cable for the ETU to trigger so probably just some wiring converter to go from those mini spades up to deans or mini tamiya.
I'd bet that it's just connector for the battery wiring to get through the stock tube. As a fair few aeg don't use the tube threads to connect to the receiver. The tube slides over a support post with a small hole for the wires but not big enough for the tamiya connector to get through. Like g&g use spade connectors.