The MacBook Pro 13 inch released in 2016 (and later) use a 61W USB-C adapter while the MacBook Pro 15 inch released in 2016 (and later) use a 87W USB-C .
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Louis Rossmann 333,684 views. . Why is PP3V3_G3H the most important power line on USB-C Macbook Pros.
There is also a brick on phone chargers, which lower the voltage more than the MacBook Pro chargers do. Thus making it safer to do this way. But don't start .