330mah Eurus Li-polymer 616-0223 Battery Pack for Apple Ipod NANO (1GB , 2GB , 4GB) MP3 Player + 2x Tools 330 mAh High Capacity, 3.7V, with Longer Runtime Li-Polymer Rechargeable Internal Battery Made from High Quality Japan Cells 100% compatible with original batteries and chargers for Apple iPod NANO (1GB , 2GB , 4GB)