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What happens if you use the Apple 29W USB-C Power Adapter to charge the Dell XPS 12 9250 2-in-1 Laptop?

Using software from Granite River Labs, we can see that the Apple 29W USB-C Power Adapter first offers 12 watts (5 volts @ 2.4 amps) and 29.6 watts (14.8 volts @ 2 amps).

However, in the end the Dell XPS 12 9250 2-in-1 Laptop only requests 5 volts @ .9 amps from the Apple 29W USB-C Power Adapter which means it will charge a lot slower than the 30 watt adapter that comes with the Dell XPS 12 9250.