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Thread: Xtar MC4 constantly overcharges!

  1. #1
    Unenlightened
    Join Date
    May 2021
    Posts
    1

    Default Xtar MC4 constantly overcharges!

    Hi,
    I have bought an Xtar MC4 in 2020. I use it for charging unprotected 18650s. End voltage for my cells are mostly around 4.22-4.25V. The charging led remains red sometimes even around 4.27V, then i terminate charging manually. I have tested many old/new 18650 cells, various 5Vdc adapters and different charging slots. I suspected it is fake. As you can see in the images, the branding style is different from packaging. But the build quality is too good to be fake. I have also MC1, it charges exactly to 4.19-4.20V. Do you have any suggestions?

  2. #2
    Flashaholic* orbital's Avatar
    Join Date
    Feb 2007
    Location
    Great Lakes
    Posts
    2,935

    Default Re: Xtar MC4 constantly overcharges!

    +

    Branding & graphics on the unit are different to the graphics on the box and all online pictures.
    Quite possibly a fake.



    __________________________________________________ ___

    My XTAR chargers are my favorite


    Add: if all the sudden you post praising another brand of charger, that'll send red flags to CPF Administrators.
    Last edited by orbital; 05-08-2021 at 03:53 PM. Reason: Add:

  3. #3
    Flashaholic
    Join Date
    Nov 2009
    Location
    Ottawa Ont. Canada
    Posts
    481

    Default Re: Xtar MC4 constantly overcharges!

    Looks a bit high. Genuine or not I would not continue to use it. Cell life can be extended a fair bit by terminating lower,
    say 4.10v with slightly lower capacity per charge.

    A have a cheap 2-bay charger which also terminates a bit high. Opening the charger I found no control circuits;
    all of it being in the wall-plug adapter which specified 4.2v but obviously with some tolerance.


    Dave

  4. #4
    Flashaholic* Thetasigma's Avatar
    Join Date
    Nov 2015
    Location
    Michigan, USA
    Posts
    1,166

    Default Re: Xtar MC4 constantly overcharges!

    Construction and labeling is off, going with fake or illegitimately repurposed first runs that had an issue with overcharging with a weak power supply or long cable.

    Source a legitimate charger from a reputable dealer.

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