Best answer: The Smart Battery Case should work with the iPhone X, though the case won't fit as well as if you were using it with an iPhone XS. Because of this, you might still want to get a case meant for the iPhone X, like the Mophie Juice Pack Air.
The Smart Battery Case should work with your iPhone X, but there are caveats
While Apple only lists the compatibility of the iPhone XS Smart Battery Case as being iPhone XS, according to Apple, the case should still work fine with the iPhone X. That being said, some users might see a compatibility error when they connect the iPhone X to the case, but you should just need to dismiss the error in order to get the case to start working.https://twitter.com/reneritchie/status/1085621933583015937
Additionally, there are some fit issues between the Smart Battery Case and the iPhone X. While the iPhone X and iPhone XS are almost exactly the same size, there are some differences in the size of the camera module and placement of the speaker/microphone grills on the bottom that lead iPhone XS cases not quite fitting correctly on the iPhone X. If you choose to use the Smart Battery Case with the iPhone X, expect reduced acoustic performance.
If you want a battery case meant for your iPhone X, there are other options
If you want a battery case that is sure to fit with your iPhone X, there are plenty of options available. A number of companies produce battery cases for the iPhone X, including Mophie, which makes the Juice Pack Air, a case that can extend the battery life of your iPhone X to a total of 30 hours.
Or you can choose from one of the other cases listed in our guide. A lot of them are even cheaper than the Smart Battery Case.
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