"Unable to verify this iPhone has a genuine Apple battery"

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Also know here --> Apple Repair and Repair Status Check - Official Apple Support

take it back to the Apple Store or the Apple Certified Repair Shop that fixed it. If you had it replaced outside of those you need to take it up with whoever opened it up and replaced the battery, Apple would not be able to assist if that's the case.

So.....is it a genuine Apple battery....or not....?

Who (what company) replaced the battery?