[. . . ] The rechargeable battery in iPod should be replaced only by Apple authorized service providers. For more information about batteries, go to www. apple. com/batteries. 1 Using the iPod USB Power Adapter (available separately) If you use the iPod USB Power Adapter (sold separately at www. apple. com/ipodstore) to charge iPod, make sure that the power adapter is fully assembled before you plug it into a power outlet. Do not connect or disconnect the iPod USB Power Adapter with wet hands. [. . . ] Do not use any power adapter other than an Apple iPod power adapter to charge your iPod. Always allow adequate ventilation around the iPod USB Power Adapter and use care when handling. Unplug the iPod USB Power Adapter if any of the following conditions exist: Â The power cord or plug has become frayed or damaged. Â The adapter is exposed to rain, liquids, or excessive moisture. Avoiding hearing damage Permanent hearing loss may occur if earbuds or headphones are used at high volume. You can adapt over time to a higher volume of sound that may sound normal but can be damaging to your hearing. If you experience ringing in your ears or muffled speech, stop listening and have your hearing checked. If the connector and port don't join with reasonable ease, they probably don't match. Make sure that the connector matches the port and that you have positioned the connector correctly in relation to the port. Keeping iPod within acceptable temperatures Operate iPod in a place where the temperature is always between 0º and 35º C (32º to 95º F). iPod play time might temporarily shorten in low-temperature conditions. Store iPod in a place where the temperature is always between -20º and 45º C (-4º to 113º F). Don't leave iPod in your car, because temperatures in parked cars can exceed this range. When you're using iPod or charging the battery, it is normal for iPod to get warm. [. . . ] Don't leave iPod in your car, because temperatures in parked cars can exceed this range. When you're using iPod or charging the battery, it is normal for iPod to get warm. The exterior of iPod functions as a cooling surface that transfers heat from inside the unit to the cooler air outside. [. . . ]