If you connect to a low or non-powered port, iPod shuffle will not charge. Once the iPod shuffle is plugged in, it will take about 2 hours to charge the battery to 80% capacity and about 4 hours to charge it to 100%. Find out how to check the battery charge here.For information on status lights while connected, click here. Connect the iPod shuffle USB cable connector into a high-power USB port on your computer. 2  Note: To charge an iPod shuffle battery, connect the device to a high-power USB port. 3  Please be aware that USB keyboards and non-powered USB hubs generally do not have high-power USB ports.