Description: MP3 & Portable Audio Player Application: Portable Audio/Video Player Original Brand: Apple Ipod Chemistry: Lithium Ion (LiIon) Voltage: 3.7V Nominal Capacity: 750mAh Width: 36.5mm Height: 4.3mm Length/Breadth/Depth 50.6mm Weight: 17.5g battery for Ipod 4th generation, iPod Photo 30GB, iPod Photo 40GB, iPod Photo 60GB, iPod U2 20GB M9787 This battery is a compatible alternative to that of the original brand