New 220mAh Replacement Battery for iPod Nano 7th Generation Replaces the following battery part numbers: 616-0639, 616-0640 Replaces the following part numbers: A1446 , MD481LL/A For best results for li-on batteries, please FULLY CHARGE the item overnight, and then on its first use, FULLY discharge the item. (Use the item until it fully depletes its battery after its first charge) Compatible with all Apple iPod Nano 7th Generations DISLCAIMER: The names for Apple iPod, etc. are used for the sole purpose of describing the compatibilty of our items and identifying models they work with. These names are the copyrights of their respective owners. MCMConcepts does not intend to infer any connection / ownership / affiliation between MCMConcepts and any other company.