It may be because the battery quality is poor or the charging port is faulty. First you can try to re-plug the charger, clean the charging port, or replace a different charger and charging cable to try to solve the problem. If the problem persists, you may want to consider replacing the battery again or seek the help of a professional repairman.
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You can also look at your device's Settings and applications to make sure there are no Settings or applications that are causing the battery to drain abnormally. I hope the above suggestions can help you solve your problem.
It may be because the improper installation of the battery cell during the battery transplantation leads to poor cell contact, the connection line between the charger and the battery has a problem leading to poor charging, or the transplanted cell parameters do not match the primary battery.
The solution is to check the installation and connection of the battery cell to ensure that the plug and connection line are normal, or replace the appropriate battery cell. At the same time, it should also be noted that battery transplantation is an operation that requires professional skills, and it is safer and more reliable to choose experienced maintenance personnel or manufacturers.
Maybe there's something wrong with the charging port.
You can check whether the charging port is damaged, and replace it in time if necessary; Clean the charging port with a cotton swab to ensure that it is clean and free of debris; Make sure the charger and cable are suitable for the iPhone and are not damaged; Check the phone charging Settings to make sure everything is normal; If the problem persists, check the battery health at an Apple authorized repair site; Try restarting your phone or updating to the latest version of iOS.