1200mAh Eurus Internal Li-Ion Battery for Apple iPod 4 Generation (4th, 4G, 4Gen) MP3 Player + Special Toolkit + Special Torx Screwdriver Tool and Installation MANUAL 1200 mAh Ultra High Capacity, 3.7V, with Longer Runtime Li-Ion Rechargeable Internal Battery Made from High Quality Japan Cells 100% compatible with original batteries and chargers for iPod 4 Generation (4th, 4G, 4Gen) MP3 Player