Can a 100-watt USB-C charger be safely used with any Mac?

USB-C was developed as a robust multi-function standard that would finally let a single industry-supported jack provide high-wattage power and super-fast data. In the fuss about the transition from USB Type-A and Appleā€™s original MagSafe and MagSafe 2 magnetic laptop charging system, the joy of a single cable may be lost. A hallmark of USB-C is that you can plug any USB-C plug into any USB-C jack. The jacks on two devices negotiate what they have in common. Sometimes,

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