How to make my battery health back after I replaced my battery

Read about the importance of having the battery replaced by a qualified technician using a genuine iPhone battery:

About genuine iPhone batteries

Repair Provider Verification - Official Apple Support

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This indicates that a genuine Apple battery was not installed on your phone. Take the phone back and have a genuine Apple battery installed, and the message will go away.

If you installed the battery yourself, there is no way that the battery is genuine because Apple does not sell parts to non-authorized service shops.