used once, it is a batt.pack that came with it when i bought it.just bought them about christmas. my son was sick with cancer an i thought this would be good to have so the grand kids could playlonger an we didnt use them but once because we were not in the mood to play because my son passed. dec.22 i dont play the wii that much to worry about carging them i just went an bought batt to keep on hand.