Turning our attention back to the Battery side of the Headphone and moving the battery out of the way, we see that the USB and Charging Interface PCB is also held in place with a Phillips Head #00 Screw

Removing the screw, and gently prying against the Charging and USB Interface PCB allowed it to come free and be removed from the Headphone Enclosure

The USB and Charging / Interface PCB was held in place via double sided foam tape

While removing the USB and Charging Interface PCB, a small circular disk was found covering the larger connection hole on the enclosure. This disk is magnetic may be used to help hold the headphone in the charger. The disk was also held in place with foam tape