What's the difference between charging while plugged in compute, as to wall charger?

Discussion in 'Droid RAZR MAXX' started by aarong03, Sep 1, 2012.

  1. aarong03

    aarong03 Member

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    I sometimes hook my Maxx up to my computer to charge it at work. Well I've noticed that when I let it charge up to 100%, then unhook it. The battery takes a lot longer to come off 100%. When I charge it using the wall charger, as soon as it reaches 100% I unhook it. Right after the plug is unhooked it drops to 99%. Why is that? Not that I'm worried, but just thought it was odd it does this.
     
  2. cbreze

    cbreze Member

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    I think it may have to do with the speed of the charge. USB charging is more like a trickle charge while the wall charger is a faster charge. FWIW, I've noticed the same thing.
    Edit: my car charger is the fastest of all my charging methods and consequently the discharge rate seems faster to me.
     
    Last edited: Sep 1, 2012
  3. captkkk

    captkkk New Member

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    USB on computer using 0.5A
    Wall charger is about 0.75A or 0.85A

    Sent from my RAZR Maxx using Droid Forums
     
  4. Beckeramos

    Beckeramos Member

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    Hopefully this link helps you. Go 5 posts down and read foxkats reply...

    http://www.droidforums.net/forum/droid-razr/214390-battery-life-horrible-2.html
     
  5. kevins686

    kevins686 Member

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    Here's the difference for me: I charged overnght via USB, the first time I've done this with this phone. And today, almost 7 hours after I unplugged this morning, I'm still showing 100% on my battery.
     
  6. aarong03

    aarong03 Member

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    Exactly. That's what mine will do.
     
  7. kevins686

    kevins686 Member

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    Aside from the initial drop from 100%, have you noticed whether your battery lasts longer overall when you charge it via USB?
     
  8. aarong03

    aarong03 Member

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    Going try that starting this afternoon. I will advise later this week.
     
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