Sony WF-1000XM4 Charging Case Battery Replacement - iFixit Repair Guide
Amazon.com: KUBOJSDLZ USB Charging Port Replacement for Sony WH-1000XM4 Wireless Bluetooth Noise Canceling Over-Ear Headphones Charging Port Board Repair Kit : Electronics
The battery life of Sony's earphones 'WF-1000XM4' suddenly became short, so I summarized the steps to get a free replacement, zero shipping and repair costs, even if the warranty has expired -
Sony WF-1000XM4 Wireless Right Side EarBud Replacement WF1000XM4 Black - 2.0 | eBay