How to fix "important battery" message on iPhone?
There is something wrong with my iPhone 13 and it is saying important battery message and how do you fix that?
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Question marked as
Did you have the battery replaced at a third-party repair shop? If so, they used a non-Apple battery and you are stuck with that message.
If you haven't had the battery replaced, it is failing and needs to be replaced.
iPhone Battery Replacement.
iPhone Battery Repair & Replacement - Apple Support