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Does my iPhone automatically uses the backup battery when it needs to?

iPhone 11 Pro Smart Battery Case - Pink Sand

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    Charge your Smart Battery Case
    Before you start using your Smart Battery Case, update your iPhone to the latest version of iOS. Also make sure that you charge your Smart Battery Case before you use it.

    Plug the Lightning to USB cable that came with your iPhone into the Lightning connector on the case.
    Plug the other end of the cable into an Apple USB power adapter, then plug the adapter into a power outlet. For the fastest charging, use an Apple USB-C power adapter that provides 18 or more watts of power.
    You'll see an amber status light while the case is charging. When the case is fully charged, you'll see a green status light.

    Attach and remove your case
    To attach your case, pull back its top edge and slide your iPhone in. When you put your iPhone in a Smart Battery Case that has a charge, your iPhone charges automatically.

    To remove your case, pull back its top edge and slide your iPhone toward the top of the case. Slide up—not toward you—or you could damage the connector.

    Check the charge
    When you attach your iPhone to your case, a charging status appears on the Lock screen. The status also appears when you connect the case to power or disconnect from power. If you already attached your iPhone to your case, look for the charging status in Today View on your iPhone.

    Charge your case and your iPhone
    With your iPhone in your case, plug the Lightning to USB cable that came with your iPhone into the Lightning connector on the case.
    Plug the other end of the cable into an Apple USB power adapter, then plug the adapter into a power outlet. For the fastest charging, use an Apple USB-C power adapter that provides 18 or more watts of power.
    When your iPhone isn't in the case, you'll see a green status light when the case is fully charged or an amber light when the case is charging.

    If you have the Smart Battery Case with Wireless Charging for iPhone 11, iPhone 11 Pro, or iPhone 11 Pro Max or the Smart Battery Case for iPhone XS, iPhone XS Max, or iPhone XR, you can

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