Our initial testing of charging an iPhone 12 using an 18W charger instead of a 20W charger shows that you can charge an iPhone 12 from 2% to 59% in about a half-hour. However, in our own testing, an 18W charger had pretty similar results. Officially, the iPhone 12 models can only fast charge connected to a 20W charger. You'll only get these speeds using a 20W charger, any less, and MagSafe will charge much, much slower. Wireless charging is always a little less efficient than charging directly via the lightning port, but 15W charging through a wireless charger like MagSafe is pretty dang fast. The MagSafe charger can charge your iPhone 12 with 15W of power if you pair it with a 20W USB-C charger. However, to use it to its full ability, you will want to pair it with a 20W charger. The MagSafe charger is a neat little Qi wireless charger that snaps nicely on the back of your iPhone 12.
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