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The iPhone EXR comes standard with a 5WUSB power adapter.
But iPhone EXR support fast charge, it is recommended to use 18w, Apple xr fast charge maximum support 61w, can be used by iPhone EXR support fast charge Apple official charger has Apple18W, 29W, 30W, 61W and so on
Apple xr charging with 40w charging bank will hurt the battery, but the impact on the motherboard is little you can rest assured. 40w charging will accelerate the aging of the battery. It is recommended not to use such a large power charge.