I have a Samsung S8 phone, which has USB-C charging connector. I lost the original charger for my phone, but I have the original USB-C charger for my Huawei Matebook X Pro laptop. Is it possible to use this charger to charge the phone? Is the USB-C standard itself a guarantee that all the relevant characteristics will be equivalent?

Here is the electric info from the mobile phone charger (which has USB-A female output connector, and there was USB-A to USB-C cable which I lost):

OUTPUT: 5.0V = 2.0A, 10.0W
        9.0V = 1.67A, 15.0W

Here is the electric info from the laptop charger (which has USB-C female output connector):

OUTPUT: 5.0V = 2.0A, 10.0W
        9.0V = **2.0A**, **18.0W**
       12.0V = 2.0A, 24.0W
       15.0V = 3.0A, 45.0W
       20.0V = 3.25A, 65.0W 

(There is a difference in ampere and wattage for the 9.0V, is that a problem or is it that the device will just take what it needs?)

  • Is the wattage really 18.0W? Wattage is Voltage x Ampere, so having the same V and A shouldn't produce a different W.
    – Andrew T.
    Commented Oct 10, 2022 at 12:31
  • @AndrewT. sorry, there is a difference in amperes too! I have edited the post. Thank you very much!
    – Tomas
    Commented Oct 10, 2022 at 12:39

1 Answer 1


According to Wikipedia Samsung S8 uses Qualcomm Quick Charge 2.0 for the higher voltage levels. When using a standard USB-C charger with the S8 the maximum is 5V * 2.5A = 12.5 Watt.

Most likely the laptop USB-C charger only supports USB Power Delivery and thus it will charge at maximum with 12.5 Watt.

  • ... so, the conclusion is? :-)
    – Tomas
    Commented Oct 11, 2022 at 11:59
  • @Tomas The conclusion is what I wrote in the last sentence. Expect to get 12.5 Watt @ 5V.
    – Robert
    Commented Oct 11, 2022 at 12:27
  • so, what is the answer to my question?
    – Tomas
    Commented Oct 12, 2022 at 13:33
  • @Thomas I am sorry but the answer is clear and I have already written it: your phone does not support USB power delivery with more than 5Volt so it will not load with 9V because it only supports proprietary Qualcomm Quick Charge 2.0.
    – Robert
    Commented Oct 12, 2022 at 15:01

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