Released September 21, 2018. Models A1921, A2101, A2102, A2104. Available as GSM or CDMA / eSIM or nano-SIM / 64, 256, or 512 GB / Silver, Gold, or Space Gray. (Pronounced "iPhone 10 S Max.")

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Error showing "Unknown part" after battery replacement

After replacing the battery in my iPhone XS Max, an error message "Unknown Part" appeared in the settings.

The Settings>Battery>Battery Health cannot display battery percentage.

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This is normal behavior and is another way for Apple to discourage people from repairing their own devices. A warning is displayed in the introduction of the iFixit guide for battery replacement on this phone. If your phone is acting normally, you can safely ignore this warning.

Keep in mind that Apple continues to make moves like this that hurt the repairability of their products. Replacing the screen, battery, home button (if applicable), and/or front sensor assembly (on iPhones with Face ID) will trigger a message or cause some functions not to work on many iPhones and other Apple devices. Some tools, like the JC V1S, will restore the battery health functions but may not remove the "battery may not be genuine" message.

Serialization of parts is one of the things trying to be fixed by "Right to Repair" laws. You can learn more about Right to Repair under the Advocacy section on the footer of the iFixit website.


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There's a small board attached to the anode/cathode of the battery.

For a DIY repair, you'll need to transfer this board from the original to the new using a spot welder.

Then a programmer to reset the charge cycle of the battery.

Totally unrealistic/not cost effective for a one off at home, you would need a really good, reputable repair shop to carry this out.


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