1. hell911's Avatar
    *title*

    usb charging from laptop: 55 mins, 24% charged.
    wall charging: 44 minutes, 12% only charged.

    yea i know the time is not same, but look at the difference.
    10-25-2013 02:40 PM
  2. srkmagnus's Avatar
    On all the devices I've owned it's been the opposite. I'm not sure what is technically the quickest, but wall charging has always proven faster for me.
    10-25-2013 05:42 PM
  3. dbareis's Avatar
    Damaged wall charger or cable , throw away

    Sent from my Nexus 4 using Tapatalk
    10-25-2013 05:58 PM
  4. gabbott's Avatar
    A wall charger can charge faster than if charged through a computer USB port since the computer USB port is limited to 500mA. A working wall charger that is higher than that has the ability to potentially charge faster.

    My GS4 comes with a 2amp charger and charges noticeably faster on that then if plugged into a computer.

    For the OP, look at the output amperage of the charger and possibly try a different one if it's higher than 500ma and you are getting those results. It all depends on the output rating of the charger. Even the USB cable can make a difference.
    10-25-2013 06:10 PM
  5. hell911's Avatar
    Damaged wall charger or cable , throw away
    Sent from my Nexus 4 using Tapatalk
    i didnt received any "dedicated" charger, all is received was cable (usb to micro usb) , and usb to wall adapter.

    a. http://mizco.com/iessentials/media/c...-usb__3__2.jpg
    b. http://thumbs1.ebaystatic.com/d/l225...U0r5KpzuxA.jpg

    - so if i want to charge my phone from laptop, i use the usb to micro usb cable.
    - if i want wall charging, i connect the adapter to cable and to my phone.

    maybe this (adapter to cable to phone) thing is causing slow charging?
    10-25-2013 09:18 PM
  6. Golfdriver97's Avatar
    I would be inclined to agree the wall unit may be faulty. For me, the only way to charge my phone via PC is to turn the phone off.
    10-25-2013 10:33 PM
  7. TeknoBug's Avatar
    How is it a fact? USB does 2.5V-5V ~500mA, wall chargers do 5V-5.2V ~1-1.5A.

    I'd suspect a bad plug, if you hear any kind of buzzing or high frequency (even quiet) coming out of it, stop using it.
    10-26-2013 05:38 AM
  8. Adamsberg's Avatar
    Came this charger (USB to wall adapter) which is shown on the pic with your phone?
    10-26-2013 06:09 AM
  9. garublador's Avatar
    How much battery was left in each case? Was the phone on in each case? I don't think we have enough information to determine if anything is wrong. Your best bet is to download an app that reports charge current and see what you get in each case at different battery levels.

    Sent from my SCH-I545 using AC Forums mobile app
    Adamsberg likes this.
    10-26-2013 10:12 AM
  10. hell911's Avatar
    usb cable
    80 degree celcius
    30V
    25awg+2c
    non-pvc

    usb-to-wall adapter
    100-240V / 50-80Hz
    0.15A
    output... 5.0V = 1.0A

    (this is the adapter and cable i got)
    10-26-2013 10:13 AM
  11. Adamsberg's Avatar
    Have look at your phone's Settings, Power ... what do you see for charging, "Charging (USB )" or "Charging (AC)" when you are using the usb-to-wall adapter?
    10-26-2013 10:40 AM
  12. hell911's Avatar
    it says charging AC
    10-26-2013 11:02 AM
  13. Adamsberg's Avatar
    Well ... charging rise from 0% to 100% by time is nonlinear, means for to compare USB and AC charging you've to start charging at the same % level in both cases. Did you ?
    10-26-2013 11:36 AM
  14. hell911's Avatar
    i will try it. and post the results.
    10-26-2013 12:32 PM
  15. hell911's Avatar
    WALL ADAPTER
    59% 1:03pm
    82% 2:17pm

    USB CHARGING
    59% 6:03pm
    89% 7:17pm

    so, USB did better than wall adapter, idk why.
    Adamsberg likes this.
    10-31-2013 06:19 PM
  16. Adamsberg's Avatar
    Well, it's interesting, maybe the charger (USB to wall) is defective.
    Or still caused by the chosen % range ... in that upper part of percentage range the Li-Ion cells draw only a part of its max allowed amperage.

    To find out about this oddity you'd install a battery app for measuring the charging amperage like 'Battery Monitor Widget'.
    The app logs the charging and will show you amperage and %-capacity, even in a graph, no need to monitor it by yourself.
    So you'd log a whole charging cycle for both charging modes and look later on the log, say at what time was needed between 10% and 100%.
    11-01-2013 02:37 AM
  17. TeknoBug's Avatar
    AFAIK a USB plug has 2 pins for voltage, perhaps 1 isn't functioning in the wall plug and only providing half the power to charge? Does the battery get hot at all?

    Yeah try another wall plug if you can find one (don't use a tablet plug though).
    11-01-2013 05:31 AM
  18. Calvin Y's Avatar
    Just plugged my Moto G into my PC and it's gone from 13% to 61% in about 20 minutes. Either something is very wrong or my PC is just that amazing.
    06-11-2014 11:32 PM

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