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Aloha, We had the same question after Geeksquad installed it.. They said it does not require battery because it is operated directly through the main circuit breaker. Hope this is helpful.. - Rose
Sorry, there was a problem. Please try again later.Hi JimG2, thank you for reaching out! The RTH6580WF works with a C-Wire. If further questions arise, please reach out to us on social media, we will be happy to help.— Charlie
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