SONY WF-1000XM4 Wireless Earbuds Black - Battery Replaced The earbuds' batteries have been replaced. I have tested all functions: connection, sound output, calls, and everything works without issue. Unused, separate M-size earbud tips (2) are included. I tested them for 2 hours on a full charge, and the remaining battery is about 70%. There is one drop mark (see image). The case has no scratches and is relatively clean. They will be initialized before shipping. Please refer to other sources for detailed specifications. Thank you for your consideration.