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  1. Thread Author  Thread Author    #1  
    360Mobiles's Avatar

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    Default Nexus 5: Slow USB charging with external Battery

    Hey everyone. Whenever I plug my Nexus 5 into a wall charger, it normally charges at an AC rate. However, I've found with external batteries that it charges at a USB rate even if it's plugged into a 2.1A port. Has anyone else seen this behavior? I find it odd because my Nexus 4 seems to charge at an AC rate when plugged into these batteries.
    Last edited by NotJustAPhone; 02-21-2014 at 06:03 PM.
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  2. #2  
    JeffDenver's Avatar
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    Default Re: Slow USB charging with external Battery

    Quote Originally Posted by 360Mobiles View Post
    Hey everyone. Whenever I plug my Nexus 5 into a wall charger, it normally charges at an AC rate. However, I've found with external batteries that it charges at a USB rate even if it's plugged into a 2.1A port. Has anyone else seen this behavior? I find it odd because my Nexus 4 seems to charge at an AC rate when plugged into these batteries.
    This is normal. Battery will charge the phone at USB speeds...so it will charge as if you are plugged into a PC instead of a wall outlet.

    And not all AC chargers are equal...some are higher capacity than others. The one that comes with the phone is a high capacity one. The same is true of tablets...they will often charge slowly or not at all with phone chargers...you need to use the tablet chargers to get them to charge at a decent speed.

    If you can find a battery that charges at AC speeds I'd be interested in looking at it. None of my batteries do.
  3. #3  
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    Default Re: Slow USB charging with external Battery

    Quote Originally Posted by JeffDenver View Post
    If you can find [an external] battery that charges at AC speeds I'd be interested in looking at it. None of my batteries do.
    He claims to have one- rated at 2.1 Amps.
    The stock wall charger is 1.2 Amps.

    I suspect there is something different in the wiring that tells the phone when it is being connected to a wall charger or not.
    Click "Thanks" and/or "Like" button on posts where someone helped you or you liked the posting. Nexus 5 (T-Mobile), Nexus 10, Evo LTE, Evo 3D, Evo 4G
  4. Thread Author  Thread Author    #4  
    360Mobiles's Avatar

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    Default Re: Slow USB charging with external Battery

    Quote Originally Posted by crxssi View Post
    He claims to have one- rated at 2.1 Amps.
    The stock wall charger is 1.2 Amps.

    I suspect there is something different in the wiring that tells the phone when it is being connected to a wall charger or not.
    It's most likely an issue with the Nexus 5 as my Nexus 4 seems to charge at an AC rate from the battery. Perhaps it's from the lack of Qualcomm Quick Charge?
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    Default Re: Nexus 5: Slow USB charging with external Battery

    I have an Anker external battery with two ports. One is 1A and 2A. If I plug my Nexus 5 into the 1A port it charges as AC, if i plug it into the 2A port it charges as USB... I can't figure out why either.

    I also have a 2A charger that came with my Nexus 10 and that charger can charge my Nexus 5 in AC mode at 1800mA with no problems.

    Sent from my Nexus 5 using Tapatalk
  6. #6  

    Default Re: Nexus 5: Slow USB charging with external Battery

    Yes, the n5 is very finicky on its charge rate based on what port it's connected too. The solution is to install a kernel that supports fast charge. That solves the problem

    Sent from my Nexus 5 using Tapatalk

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