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For fast charging iPhone X, you'll need Power Delivery, which delivers fast charging over USB-C, so you'd have to invest on some new cables and adapter. Check out this guide for more info on fast charging the new iPhones. https://www.zmiusa.com/blogs/blog/fast-charging-the-iphone-x-8-and-8-plus-1

The Anker one you posted doesn't seem to support Power Delivery, but I don't think it will damage your battery, so if you're okay with just normal charging not fast charging, go ahead and get it.
 
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