iPod: Testing battery life

iPod: The Battery Status Indicator Is Approximate: "The iPod battery indicator shows, approximately, how much charge is left in the battery. In some cases, you may find that the battery indicator shows a charge left, but iPod stops playing because the battery is, in fact, depleted. This does not necessarily mean anything is wrong with your iPod's battery. Follow the steps in this document to determine if your iPod's battery is working correctly."