Sharp MD-ST521-S MiniDisc Player

Sharp MD-ST521-S MiniDisc PlayerContents of Sale: Sharp MD ST521 S MiniDisc player (silver). Quantity 1. Used. Sharp 'triple shuttle' inline remote control (silver, teal). Quantity 1. Used. Sharp external AA battery case (grey). Quantity 1. Used. Genuine Sharp AD T50BT lithium ion rechargeable battery. Quantity 1. Used. * No other items or accessories are included in the sale * Summary: Tested and functional. Minor callouts regarding the appearance. MiniDisc Player: Sharp MD ST521

Contents of Sale:
Sharp MD-ST521-S MiniDisc player (silver). Quantity 1. Used.
Sharp 'triple shuttle' inline remote control (silver, teal).  Quantity 1. Used.
Sharp external AA battery case (grey).  Quantity 1. Used.
Genuine Sharp AD-T50BT lithium-ion rechargeable battery. Quantity 1. Used.
* No other items or accessories are included in the sale *

Summary:
Tested and functional. Minor callouts regarding the appearance.

MiniDisc Player:
Sharp MD-ST521

Product Condition (Appearance):
Front Face : Some marks, scuffs, and scratches. A shallow dent at the top-left.
Sides : Some wear on corners and edges.
Rear Face : A few marks or scuffs.
Internal Battery Compartment : No callouts.
All external facing screws are present and tightened

Product Condition (Functionality):
The device is functional.
See test results and photographs for detail.

Power Via Rechargeable Li-ion Battery (AD-T50BT) : OK *** Rechargeable li-ion battery is not included in the sale ***
Power Via External AA Battery Case : OK
Power Via AC Adapter (5V, 500mA) : OK *** AC adapter is not included in the sale ***

Audio Playback : OK - Placed in a chest pocket and listened to over two hours of audio with no issues.
Audio Output : OK

Volume Down : OK
Volume Up : OK
Stop / Off : OK
**** Press once to stop playback and once again to power off the device ****
Previous Track : OK
Play / Next Track : OK
Hold : OK

Disk Insert : OK
Disk Eject : OK

Device:
Sharp 'triple shuttle' inline remote control

Product Condition (Appearance):
Light signs of wear on some edges.
No noticeable scratches on the display.
No issues with the cable or the connector.

Product Condition (Functionality):
The device is functional.

Audio Output : OK
Backlight : OK
Character Display : OK
Clip : Present and functioning

Next Track : OK
Play/Pause : OK
Previous Track : OK
Bass : OK
Stop/Off : OK **** Press once to stop playback and once again to power off the device ****
Play Mode : OK
Hold : OK
Volume Down : OK
Display : OK
Volume Up : OK

Device:
Sharp external AA battery case

Product Condition (Appearance):
Light signs of use.

Product Condition (Functionality):
The device is functional.

Screw (release, lock) mechanism to attach the case to a device : OK
Power to device using a standard dry cell battery (LR6, AA) : OK

Product Information:
Released in 1998, the Sharp MD-ST521 is dedicated to disc playback, and does not have disc recording functionality.
It does not support MDLP.
Sharp claimed that it could deliver approximately 11 hours of playback when using the dedicated Li-ion battery, which was a world-first at the time. 
It features a 40 second anti-shock protection.
It weighs 120 grams without a battery or disc installed. 
It has a 3.5 mm headphone jack for audio output.

Battery:
Sharp AD-T50BT

Summary:
Excellent condition.
After a full charge, used it to play audio (SP mode) for almost seven and a half hours, and there was still power left in the battery.
Genuine original Sharp rechargeable battery for use in compatible devices such as portable MiniDisc players/recorders; this is NOT one of the third-party batteries. 

Product Condition (Appearance):
No callouts. 

Product Condition (Functionality):
Excellent condition.
Tested using a Kenwood DMC-K5 MiniDisc player (which is not included in the sale).
After a full charge, used it to play audio (SP mode) for almost seven and a half hours, and there was still power left in the battery.
** The Kenwood press release stated that a fully charged battery is capable of approximately 11 hours of continuous playback in SP mode. **
Left the battery at around 50% of capacity (storage charge) after testing completed.

Specifications:
Lithium-ion battery (Li-ion)
600 mAh
3.6 V

Product Information:
This battery is compatible with the Sharp MD-MT821, MD-MT831, MD-ST501, MD-ST521, MD-ST531, the KENWOOD DMC-K5, the Onkyo MD-P10, MD-P20, MD-P30, and the Pioneer PMD-P3, PMD-P5, and PMD-P7.
The above is not a comprehensive list.

Note:
These batteries were manufactured more than twenty five years ago. When managed correctly they should continue to be functional, but this cannot be guaranteed.
Regular use of the battery is recommended for best results. 
Avoid discharging the battery completely, and recharge the battery when there is a small amount of charge remaining. In the case of portable MiniDisc devices, this is usually indicated by a flashing operation light, or flashing battery indicator on the inline remote control.
Aim to charge to around 40-50% of battery capacity if there are no plans to use the battery for some time. 
Avoid leaving fully charged without using as this will negatively affect the lifespan of the battery.

Hopefully this information is clear and covers everything you need, but don't hesitate to reach out if you have any questions.