87W, what Volts and Amps does this charge at?

87W USB-C Power Adapter

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2 Answers from the Community

  • Best Answer:

    From the charger:

    Input: 100-240V~1.5A 50-60Hz
    Output: 20.2V==4.3A or 9V==3A (USB PO) or 5.2V==2.4A

    On a related (and very exciting) note, I was curious if I could charge my new MBPro (15" w/Touchbar) from a USB battery. IT WORKED!! The full charge on the System Information is 6829 mAh and the battery I'm using (An Anker with PowerIQ technology) is about twice that capacity. I've wanted this for years!

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  • I just measured it on my macbook pro 2016 15" using a usb-c inline Power Meter (Satechi) and it showed average 19.6v (sometimes peaking at 20.0v) and 4.30 amps when the laptop battery was almost dead. So it really does deliver the max rating. I have tried some other chargers that claim 20.0v and lower amperage rating and they will shut off internally since they can't deliver that amount of power.

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