Note: Continuous playback time was tested after playback, with the hold switch locked and the LCD in sleep mode, and no further operation. This was done to confirm the average performance of the purchased battery group, eliminating human operation. This is not based on actual usage. In reality, operations such as changing songs and adjusting the volume, etc., consume power on the LCD each time, so the playback time will be considerably shorter. In that case, setting the LCD brightness to minimum seems to extend the playback time. Note: All units are initialized in iTunes, after song loading and operation checks, only normal units are finally initialized and shipped. There is no audio noise caused by the main unit. Used, working product, main unit only. Battery replaced with a new one (2025/12/16) LCD not replaced. Displays normally. The exterior may have some scratches. Please examine the photos carefully before purchasing. Also, we request that those who understand used products purchase. Charging, PC-related operations, music playback operations, click wheel, hold switch, FM, video camera, pedometer, voice memo, and sound from the built-in speaker have been checked and are normal. Continuous playback time confirmed up to 36 hours. Test conditions: Fully charged (plug icon appears on the battery mark) Volume at the center position Airphones used were those that came with the iPod (90cm long) After playback, the hold switch was locked and left unattended Playback was checked occasionally until the estimated end time. Testing is performed to confirm the battery condition and the quality of the repair work. This is not to guarantee the time, so please understand. Please contact us within 2 days of arrival for initial defects. We will respond to issues other than the exterior. Water-damaged items and those with signs of disassembly are not covered. Thank you for your understanding.