After constantly charging and re-charging the iPod, the battery eventually loses its ability to hold a charge and needs to be replaced. This is a user-replaceable internal battery for the Apple iPod 4th and photo generation and is intended for out-of-warranty iPods only. The 4th and photo generation has a click wheel with the control buttons on the click wheel. Video installation instructions available online at www.ereplacements.com. Fits with compatible part numbers: 616-0183, 616-0206, AW4701218074, ICP053450. Retail Packaging