Masione Replacement Battery for iPod Nano 1st Generation 1GB/2GB/4GB With Tools Brand New | Li-Polymer | 3.7 V | 400mAh Compatible with iPod Nano 1st Gen 1GB/2GB/4GB 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