616-0639 616-0640 Original Replacement Battery For Apple Ipod Nano 7 7th Gen Batteries A1446 Mp3 Mp4 Battery Mb903ll/a + Tools - Mobile Phone Batteries - AliExpress
CELLONIC® Batteria 616-0337,616-0311 compatibile con Apple iPod nano 2 Gen. - A1199 / iPod nano 3 Gen. - A1236 Ricambio da 450mAh per lettore MP3 MP4 Music Player : Amazon.it: Elettronica
How to Replace the Battery in an iPod nano - YouTube