Onkyo BT-T51 Li-ion Rechargeable Battery

Onkyo BT-T51 rechargeable lithium-ion battery. Quantity 1. Used.
* No other items, or accessories are included in the sale *

Battery:
BT-T51 rechargeable li-ion battery

Summary:
Did not perform a full performance test, but following a full charge it delivered over six hours of playback, and there was still charge remaining.

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

Note:
These batteries were manufactured around twenty 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.