Masione Replacement Battery for iPod Nano 3rd Generation 4GB 8GB 616-0333 With Tools Brand New | Li-Polymer | 3.7 V | 400mAh Compatible with iPod Nano 3rd Generation 4GB 8GB This is an internal part and some minimal technical skills are required to replace it Tools are provided to open ipod and replace battery 30 days money back and 1 year warranty