Certain audio formats use more power than others. The least processor intensive audio format is MP3 encoded at 128 bits per second. But if you have a lot of songs in WMA format with DRM (Digital Rights Management), they require considerably more processing power for playback, meaning correspondingly less battery time.
Other things that consume extra power include audio processing such as equalization, high-volume levels, photo display and videos. Video probably places a higher demand on battery power than any other MP3 player feature.
Hard drive audio players also tend to consume more power than flash memory audio players. This power consumption increases the more you use your hard drive. If you're constantly browsing your directories and looking at photos while listening to music, your battery will not last as long.
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