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  1. #1
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    Default USB-C to USB-C and wall wart compatibilty - just want to verify

    I have a ZIMI PowerBank 20,000mAh and the specs say it can be charged via the USB-C input at 9v 2.5A which is of course 22.5W (I was using a 5v 2A but it is pretty slow at 10 hours). So I have purchased this Power Adaptor which can do 9v 2.22A and that should bring it down to 6 hours.

    At the same time I purchased a USB-C to USB-C cable and it will be used between the Power Adaptor and the PowerBank, and then from the PowerBank to the Phone and DAP. (I find this far more convenient than adding to the cable maze already going to the laptop - I get about 6 phone charges out of the 20,000mAh bank).

    Looking at the cable specs it says 5A 100W (so 20V even though V is not mentioned).

    So am I correct in thinking that as long as the cable is capable of carrying >= the amps of the PowerAdaptor, then all is well?
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  3. #2
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    The current will be fine as the cable states 5 amps but the voltage doesn’t ring true for me. I was under the impression USB C was 5 volts. 9 is almost double. This sounds like a smoke emitting setup to me.


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  4. #3
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    Yes. USB-C can carry higher voltage and current loads. 100W at 20V (5A) but the cable must have an enabling chip that confirms it is capable of carrying that current. So you can't set fire to a smaller cable. Without the chip it will supply 3A max, I think.
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    Quote Originally Posted by forrestmount View Post
    The current will be fine as the cable states 5 amps but the voltage doesn’t ring true for me. I was under the impression USB C was 5 volts. 9 is almost double. This sounds like a smoke emitting setup to me.

    Thanks for your reply.

    Hmmm. It says 5A 100W, which means 20V capability (for the cable). I just checked a Mac laptop which has a USB-C coming off its wall wart, and it's 30W, 15V, 2A.

    AFAIK USB-C is a much higher rating than USB 3.0 (which is why things charge much faster of course - that's the whole idea). Then again, I don't know what USB 3.0 is rated up to.
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    Quote Originally Posted by NCArcher View Post
    Yes. USB-C can carry higher voltage and current loads. 100W at 20V (5A) but the cable must have an enabling chip that confirms it is capable of carrying that current. So you can't set fire to a smaller cable. Without the chip it will supply 3A max, I think.
    This cable does have an enabling chip, as luck would have it. It's a "Type-C 3.1 Gen 2" which can also transfer 10Gbps which 1.25GBps which is kenfast! My new solid state drives will only read at about half that speed.
    Regards, FenceFurniture

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  7. #6
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    The description does state 20v.

    493EDD50-2D75-4126-82A0-F0BF2278B65E.jpg

  8. #7
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    Yes, some devices achieve fast charging via higher voltages, so they use a chip to ensure they don't cook lower voltage devices.
    Semtex fixes all

  9. #8
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    So many correct answers.

    USB-C is a MESS.

    An absolute mess. There are so many sub-standards and conflicting symbols that when one reads up on things you'll find its more a bunch of .... guidelines.

    I went and bought this charger after a ridiculous amount of research --> USB C Charger and Quick Charge 3.0 ,Ieiehd 2 in 1 2Port 18W Power Delivery USB-C and USB A Fast Charger

    The maximum watts delivered on any charger is 105 watts*. This had a whole bunch of doodads to ensure that devices weren't fried. When reading about these 60 watt chargers and cables literally everyone had exploded devices and fried ports/computers.

    Wrong port? Boom. Wrong cable accidentally, once? Boom. Device a bit dumb and reports via the cable/charger incorrectly? Boom.

    One is playing with fire. Here there be dragons!


    Edit - Wifeypoo and I have Xiaomi MiMax2 phones and she is terrible at charging hers. She kills it constantly and usually its 10 minutes before going out that she "remembers" to charge it. The charger above really thumps the juice in. It must be lethal to the batteries longevity though.....

    * is this one the biggest? CHOETECH USB C Charger, PD100W GaN Charger

  10. #9
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    Just keep in mind that the faster you charge the lithium battery the shorter its life. The fast charge doesn't come for free.

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