Discover the trusted quality of CoreParts with our top quality replacement battery for Sony Wireless Headset. This 1.93Wh Li-Polymer battery operates at 3.85V and has a capacity of 500mAh, designed for the WF-1000XM4 charging case. Engineered to deliver unmatched performance, this battery ensures that your device remains powered and ready for all your demands. Produced in China with rigorous quality control, each component meets high standards for reliability and longevity. Backed by a 12-month warranty, CoreParts products offer you confidence in every use, knowing you're investing in sustainability and cost efficiency. Our easy-to-install parts help you avoid costly replacements, empowering you to extend the life of your devices, reduce e-waste, and support a greener future. Choose CoreParts for high-quality, value-driven solutions that stand up to daily use and deliver ongoing reliability.