Panasonic Cordless Phone Plain Paper Fax Model KX-PW820-S

This is a Panasonic telephone with an additional handset and plain paper fax function.
Model number is KX-PW820-S (KX-PW820DL).

It was used without any issues until I canceled my landline service at the end of January this year.

* The cordless handset's rechargeable battery depletes quickly, and there are stain-like marks on the charging stand. It takes a full day to fully recharge the battery once it has completely run out. Please replace the battery when using it. Genuine batteries appear to cost around 2,100 yen on Rakuten.

* The instruction manual can be downloaded online. The model number KX-PW820-S is written on the front of the main unit, but you can download the manual for model number KX-PW820DL from the sticker on the back of the unit. Please refer to these.

Model Number: KX-PW820-S (KX-PW820DL)
Color: Silver
Accessories: Cordless handset (please consider this a bonus as battery replacement is recommended)

Thank you!
I am open to reasonable price negotiations, so please feel free to comment.