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Hello, thank you for your question. The battery in these Insignia™ RF Wireless Over-the-Ear Headphones is built-in and not designed to be replaced by the user. The headphones are rechargeable and intended to be used with the included charging base or cable. If the battery performance decreases over time, the entire unit would typically need to be replaced rather than swapping out the battery. Sudeep | Insignia
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