The real story behind MagSafe, USB-C PD, and why you need a 20W AC charger | AppleInsider
If you want to charge your iPhone 12 using MagSafe, Apple recommends using certain 20W AC adapters — and they don't need to come from Apple, despite what you may have heard. We explain what the requirements are, and why an older 18W adapter just won't cut it.
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