I replaced the batteries in my SONY LinkBuds S earbuds. I replaced the batteries in the earbuds. Sound output, connection, calls, and noise cancellation all work without issue. The case and earbuds are also relatively clean with no scratches. Since I replaced the batteries, they should be good for over two years. I measured the case battery, and it's still fine. Please see the SONY website for the detailed specifications of the LinkBuds S. Sony Model Name...LinkBuds S