Battery cover from another controller. The product is a Nintendo Wii Remote Controller with MotionPlus Inside, Nunchuck, and Silicone Sleeve. It is black in color and made of plastic. It is designed for the Nintendo Wii platform and is compatible with the Nintendo Wii U and Nintendo Wii consoles. The controller is wireless and is branded by Nintendo. It does not have any fans and has a model number of RVL-003. It is a controller for one player and does not offer personalization.
eBay