Most people buy a portable audio player for its portability. Being free to take your music with you everywhere you go is one of the big attractions of MP3 players. This portability, of course, is dependent on battery life, so paying attention to battery specifications is a good idea when buying an MP3 player.
Most manufacturers rate the playing time of their MP3 players. This figure refers to the number of hours of continuous music playback that can be expected on a full battery charge. It can range considerably - from 10 hours up to 35 hours.
When looking at manufacturer's specifications, keep in mind that they are most likely at the high end and represent the playing time under ideal conditions. For example, if the manufacturer rates their MP3 player at 20 hours, this probably means 20 hours of continuous playing (stopping and starting the player uses more power), with no extra features like screen displays being used.
Of course, you don't have to power your MP3 player with batteries - it can be plugged into the wall with an AC adapter or draw power from the computer. Some people use their portable players as part of their home stereo system, so an AC adapter would be the perfect power source for this kind of situation.
Additionally, for those who like to listen to their MP3 player in the car, an adapter that draws power from the cigarette lighter is ideal.
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