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Hello Pik, Thank you for your interest in Sony products! We’re happy to assist with your questions as you consider the WH-CH720N headphones. Please note that the battery in these headphones is not designed for user replacement. If you do experience any battery performance issues in the future, Sony Customer Support or an authorized service center will be available to provide professional servicing or discuss replacement options. This ensures your headphones maintain excellent performance and a great listening experience over time. Best regards, -Fred
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