Many Ipod users use the usb data cable for charging but are not sure when it started to charges. The Ipod will not charge immediately when you connect to the usb cable to your computer. It will first connect to your computer and Open iTunes. Synchronizing the iTunes and any other stuffs as set by the users is its first task. As long you see a battery logo beside your devices, the Ipod is now drawing power supply through the USB power. It will synchronize your Music, Podcasts, Movies, TV Shows, Radio, Photos, Contacts, Calendar and Games. After iPod sync is complete as shown on the top of the iTunes, charging on your iPod will start soon. You will see charging with a battery graphical display on your iPod.