Sony MZ-E520 MDLP Minidisc player. Tested with pre-recorded and recordable discs

Internal battery bay works fine - no battery is included.

I go over these units prior to listing to be sure they play using the internal battery slot. They will read recordable discs and change

tracks from end to end and all buttons work. If there is corrosion on the battery contacts I clean, scrape, and sand the contacts.

If there is something special you're looking for reach out to me. For more information about Minidiscs look for "Minidisc Central" on 

Facebook and you can find me there. 

If you're in need of a battery charger search Amazon for "Snado LCD Display Universal Smart Charger for Rechardable Batteries"