Battery Replacement for 2nd Generation Microsoft Zune 80GB and 120GB models. 3.7V 850mAh Soldering is required for this battery. This is an easy DIY installation with all the tools included for complete tear down. If you would like us to perform the upgrade give our service center a call at 269-344-7646 Beware of cheaper imitation batteries that will NOT work correctly or report battery life incorrectly on the screen. These batteries are 100% better quality than any battery on the web or eBay. Our battery cells are the best on the market, we assure you that the materials used to make these batteries far exceeds other sellers! We have been repairing Zunes since they came out so you can trust our quality. Rapid Repair has the largest inventory of iPod, iPhone, iPad & Zune repair parts in the world. Rapid Repair is the oldest and most respected full service repair shop for all your Microsoft Zune needs. Rapid Repair has Zune specialist who are ready to take your call or email regarding all your service or upgrade needs. Visit us on the web or give us a call at 269-344-7646.