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Hello there, Thank you for considering Sony products! We appreciate your inquiry about the WHCH720N headphones and are happy to assist you. The battery in the WHCH720N is built-in and not user-replaceable. However, these headphones offer a long battery life of up to 35 hours on a full charge, and quick charging provides up to 60 minutes of playback with just a 10-minute charge, making them convenient for daily use. For more details, please visit the official Sony support page: https://www.sony.com/electronics/support/wireless-headphones-bluetooth-headphones/wh-ch720n/manuals Best regards, -Fred
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