The iPod Touch makes a lot of your technological life portable. With it, you can watch movies on the go or listen to music – but it's also a tiny computer with a built-in Web browser and specifically designed programs. Thinking about it as a tiny laptop is helpful, especially when troubleshooting the device: it needs power (its battery) and a connector to charge the battery when it runs out.
Apple designed the iPod Touch to last on a single charge for up to 40 hours (for music playback) or 7 hours for video playback. A few variables come in to play with this, such as the brightness setting on the device and how often you use Wi-Fi, but Apple lists these numbers as general guides. If your battery is draining well before these times, you should contact Apple for support – you may need to replace the device. An hour or two less than expected is no reason for concern. When your screen is suddenly black and the iPod is unresponsive, the battery might be drained completely and can be recharged.
Sometimes, when an iPod Touch has a completely depleted battery, the device locks and can't be recharged or doesn't appear to be charging. Plug in the iPod as normal and then open iTunes. You should still see the device listed on the left-hand side, under "Devices." If not, eject the device and reset it. Press and hold the "On/Off" button and the home button for at least 10 seconds to force the device to reset. Then reconnect it to the computer.
Apple recommends that you always use the provided Apple (white) USB cable to connect the device to your computer and to charge the device. Third-party cables may work, but Apple doesn't support them or their use. Apple also recommends you ensure you charge your device with a USB 2.0 port. Most computers have USB 2.0 ports, but not all of your system's USB ports are necessarily high-speed. You can check your computer manual to find out which ports are USB 2.0.
Other Battery Issues
Most iPod Touch charging issues stem from the USB connection. In addition to ensuring you are using a USB 2.0 interface, Apple suggests that you always charge your iPod on a direct connection to your computer (not through a USB hub). If you have two iPods or a friend or family member with an iPod, try using another USB cable to determine if yours is faulty. Or try charging the iPod Touch on another computer to determine if your computer is the issue.