Internal Inner Li-ion Polymer Battery Repair Replacement for Ipod Nano 4th Gen 8gb 16gb it is the internal li-ion battery repair replacement for ipod nano 4th gen brand new high quality product, before shipping the function will be tested Good to do repair or refurbish use, before shipping we will test the function, if any quality problem, just feel free to contact us and we will be responsible Free Shipping from China to US with tracking number takes just 7-18 work days mostly Please make sure you could install it correctly, we suggest finding a professional to help