Vintage Sony Sports Watchman Portable Handheld TV with antenna .for parts only

Vintage Sony sports watchman. Still looks in great shape, but unfortunately, it won’t power on Maybe this is for those who are willing to take on a project, or love the retro look and like to display it. The battery compartment looks new as though the previous owner never used that area. It has a compartment for dc in but I don’t have that power supply.