This invention relates generally to a nock assembly that is illuminated and more particularly to a nock assembly that has a power source that is removable from the nock assembly for use with an electrically conductive arrow shaft having a nock, illumination member, conductor, and a power source. The illumination member and conductor are in electrical communication with the power source. The power source is in removable engagement with the nock. The principle use is for archers however other applications will benefit from this invention. For example, emergency locators and outdoor lighting displays will benefit from this invention.