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Questions many hours for recharge battery lithium via USB cable connected in Hub USB

Discussion in 'Power Electronics' started by gamer87, Mar 16, 2020.

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  1. gamer87

    gamer87

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    Mar 11, 2017
    Is it normal for a device to recharge 100% its 2000mAh lithium battery for more than 5 hours using a USB cable connected to the USB hub? my plasma pen has a charge meter on the LCD with 3 bars is equal to 100% but I put the device to recharge for more than 5 hours and did not light the 3 bars 100% stopped at 2 bars and I unplugged
     
  2. Alec_t

    Alec_t

    2,757
    733
    Jul 7, 2015
    We have no idea what your hub characteristics are or what USB negotiations (if any) occur between your pen and the hub, so can't say if it's normal.
     
  3. bertus

    bertus

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    106
    Nov 8, 2019
    Hello,

    What kind of hub is used?
    A Passive hub will only get power from the device it is connected to, likely the PC.
    An active hub will have an external power supply and might be capable of delivering more power.

    Bertus
     
  4. gamer87

    gamer87

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    Mar 11, 2017
    My Hub USB is passive hub
    In the USB Hub I connected only the pen
    Main Features:
    - Transfer Speed: Up to 480mbps
    - Provides 4 Usb Ports .0
    - Comes with USB Cable
    - Operating Voltage: 5v
    - Overload Protection
    - Current: 150mah
    - Operating Temperature: 0 ° C ~ 50 ° C

    [​IMG]
     
  5. bertus

    bertus

    322
    106
    Nov 8, 2019
    Hello,

    I do not understand the current being 150 mah.
    mah is used fro battery capacity and not for current.

    Bertus
     
  6. dave9

    dave9

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    211
    Mar 5, 2017
    Link to this hub on the seller's website or provide more info.

    Without more info, and possibly even then, there is nothing more to say except that it does not do the job and nothing is reasonable to do to it, considering how inexpensive that standalone AC-DC wall wart type USB chargers are today. You can easily find them for under $5 USD delivered, capable of 1A or more current, if you don't have some old cell phone charger lying around that is suitable.
     
  7. gamer87

    gamer87

    198
    0
    Mar 11, 2017
    Main Features:
    - Transfer Speed: Up to 480mbps
    - Provides 4 Usb Ports .0
    - Comes with USB Cable
    - Operating Voltage: 5v
    - Overload Protection
    - Current: 150mah
    - Operating Temperature: 0 ° C ~ 50 ° C
     
  8. dave9

    dave9

    863
    211
    Mar 5, 2017
    ^ That does not look like a link or more info. Maybe there is nothing more at that link, or maybe there is enough to find other sources for the product that have more specs or even someone who has done a teardown.

    The more time you have everyone spend on this, even less it makes sense to bother instead of just getting a different charger unless you just want to understand why it is that a host powered hub is not the right choice for charging devices and that this one in particular seems to have an additional bottleneck in doing so.

    They probably saved a slight bit of money on the BOM by using a higher gauge connector cable or using zero ohm resistors or thin traces instead of proper polyfuses with tighter tolerance for overcurrent protection, then whatever their upper limit was, divide it by # of ports. Even so, that doesn't change a 500mA per host port, USB2 spec.

    If it has a barrel socket for an aux PSU hookup, you could try that, but again you should just get a proper USB charger widget and use that instead.
     
    Last edited: Mar 16, 2020
    mnak likes this.
  9. gamer87

    gamer87

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    Mar 11, 2017
    If I buy a different charger will the battery charge 100%? Will this device be designed to charge using a USB cable if I use another means will it reduce the useful life of the lithium battery?
     
  10. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    We cannot know this. Give it a try.
    Probably yes, read the specs of the charger.
    Wich other means? Another cable or another charger?
    In any case the charging circuit built into your plasma pen should ensure correct charging and protection of the battery.
     
  11. gamer87

    gamer87

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    Mar 11, 2017
    Do I have a turbo-charged smartphone charger if I use it on the plasma jet pen that was designed to charge via USB will it reduce useful life the pen's battery?
     
  12. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Not if the plasma pen's internal charging electronics are well designed.
     
  13. gamer87

    gamer87

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    Mar 11, 2017
    I don't have information on the design of the internal components of the plasma pen plasma pen used battery 18650 2000mah
     
  14. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    So how do you expect us to have a satisfying answer?
     
  15. gamer87

    gamer87

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    Mar 11, 2017
    the answer to charge up to 100% does not harm the battery life of a device that was designed to charge via USB cable
     
  16. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Is this a question or a statement?
    I have no idea what you are talking about, sorry.
     
  17. gamer87

    gamer87

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    Mar 11, 2017
    is question
     
  18. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    If the device is designed to be charged via USB cable it usually accepts 5 V via that cable from whatever source. The charging of the internal battery is determined by the charging electronics within the device. Therefor if the charging electronics has been designed correctly there shall be no harm to the battery.
    Some devices accept higher voltages or higher currents than standard USB (5 V, 500 mA) for turbocharging the device. Typically this is indicated by some sort of resistor coding of the USB port or via a protocol. If your device is designed for standard USB (5 V), it can (and very probably will) be damaged if you apply more than 5 V. If you restrict the charging voltage to 5 V, however, no harm should be done.

    The specs for the hub you cite are rubbish. It is not your fault, I looked up this hub here and it states a current of 150 mAh which is nonsense. Let us assume they mean 150 mA. This means that your 2000 mAh battery will take more than 14 hours to charge.
    From a standard USB port (500 mA) charging will take more than 4 hours.
     
    bertus likes this.
  19. gamer87

    gamer87

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    Mar 11, 2017
    The only information I found on my USB hub was 5V and 150mAh if it really takes 14 hours to reach 2000mah so that's the theoretical explanation for my case

    my smartphone charger device operates 100-240V 50 / 60hz 0.3A DC 5.0V = 3.1A Max is this charger harmful to the life of the 18650 lithium battery used in the plasma pen?
     
  20. Harald Kapp

    Harald Kapp Moderator Moderator

    9,639
    2,014
    Nov 17, 2011
    I give up. What don't you understand in this sentence: "If you restrict the charging voltage to 5 V, however, no harm should be done."
     
    Martaine2005 and Alec_t like this.
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