It's better to use an 18w charger
Apple xr supports 18w fast charge. iPhone XR is a mobile phone product released by Apple on September 13, 2018, with a built-in 2942mAh battery, which supports 18w wired fast charge and Qi wireless charging, and can be charged via USB connection to a computer or power adapter.
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The Apple xr is an LCD screen with a 6.1-inch Liquid retina display, with wide color gamut support and original color display technology, and a full-screen glass with aluminum metal bezel design. With a gorgeous full-screen design, the display extends all the way to the corners of the body.