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Thread: Fenix ARB-L21-5000U 21700 USB rechargable issues

  1. #1
    Join Date
    Oct 2002

    Default Fenix ARB-L21-5000U 21700 USB rechargable issues

    Hello all,
    I have been an intermittent lurker for years but not much of a poster.

    I have recently procured several ARB-L21-5000U batteries. I have two concerns:

    1. Charging does not seem to be possible with a USB-C to USB-C cable. It is possible with a USB-A to USB-C cable. I have replicated this on multiple cells, chargers and cables.

    2. The temperature of the top terminal seems unusually hot when charging. Not good and warm, hot enough to be hard to touch for more than a second.

    Has anyone else found these to be issues as well?


  2. #2

    Default Re: Fenix ARB-L21-5000U 21700 USB rechargable issues

    Can speak about the cables, but the positive terminals on all my Fenix USB batteries get hot when charging (I have 18650s and 16340s). I imagine it's because the terminal is directly connected to the business center of the cell, whereas the rest of the cell is insulated.
    Streamlight ProTac HL - SureFire P2X Fury - Fenix PD35 v2.0 - Lumintop Tool AA 2.0 - Fenix PD25 - Sunwayman V11R XML2 6A3 mod - Olight Warrior X Pro

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