Yes, based on the info you supplied that power adapter will work. It should because it's supplying 120 watts of power ( 18.5V * 6.5A = 120W more than enough to satisfy any Mac. If you know what you're doing, then yes, it is. Is it safe to Use a 3rd party power supply? This is true with all other power supplies except Apple added some logic into their connector. This is why you could use a 90W adapter on a Mac that came with a 40W but couldn't use a 40W adapter on a Mac that needed a 90W. If it's enough, it will charge/power the laptop. Basically, the way it works is that it that it identifies the power supply as having so much capacity (wattage). The connector end is what communicates with your laptop and tells the brick how much power to supply. However, it's not the "brick" that determines if it can charge or not, it's the actual MagSafe adapter that actually determines whether or not it will interface with your Mac. ![]() The MagSafe power adapter can supply voltages from 14.5V to 20VDC. ![]() Suffice to say, it's not a "wall wart" he is using. In it, he explains why he uses a bench top power supply to deliver exactly 18.5V so he can monitor the amperage draw. It's a video by Louis Rossman of The Rossman Group the owner of a laptop repair facility that specializes in component level repair (repairing logic boards). Let's start off by addressing the video you linked to.
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