Thank you for viewing. The earbuds have been replaced with new genuine ZeniPower Z52H batteries. Both the earbuds and the case have been confirmed to be working. You should be able to use them comfortably as issues such as failure to fully charge and rapid battery drain have been resolved. Please consider purchasing. New buyers and those considering a replacement are welcome. Regarding the battery status, the test results of continuous playback for 2 hours with noise canceling ON and volume at 50% are posted, so please refer to them when purchasing. The battery status of the charging case is also posted. There are small scratches on the case. Please check the photos. The device has been initialized, so pairing should be smooth. The software version has been updated to the latest version, 4.2.1. The ear tips have been used. They have been cleaned. Please understand that the earbud body and case are used items. Cleaning and alcohol disinfection will be performed before shipping. Please see the product description here: https://www.sony.jp/headphone/products/LinkBuds_S/?srsltid=AfmBOopwvYJkcO64rWRk6fXTEh7FC5vnrGGBKaagegr54M_TE1XyyoE4 Sony Model Name...LinkBuds S Other Features...Noise Canceling