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Need to replace a battery powered detector. Do most of them have the same sort of back plate or will I generally have to attach a new back plate? Do they usually come with a back plate?

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    Back plates are usually different between brands, but they all come with back plates anyway. Might save a couple minutes if getting same brand.
    – crip659
    Commented May 22, 2021 at 20:51
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    No, they're not standardized. Commented May 22, 2021 at 22:55

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Yes, they come with a back plate, if you get the same brand (if still available) they might fit. But you'll get all the stuff you need to install them as it were a first time install.

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