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

  1. Master Droid
    aarong03's Avatar
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    #1

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

    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.
    Improving my RAZR MAXX one thread at a time.

    Aaron

    "A George divided against himself, cannot stand!
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  3. Senior Droid
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    #2
    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 by cbreze; 09-01-2012 at 12:13 PM.
  4. Droid Newbie
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    #3
    USB on computer using 0.5A
    Wall charger is about 0.75A or 0.85A

    Sent from my RAZR Maxx using Droid Forums
  5. Droid
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    #4
    Quote Originally Posted by aarong03
    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.
    Hopefully this link helps you. Go 5 posts down and read foxkats reply...

    Battery life is horrible
  6. Senior Droid
    kevins686's Avatar
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    #5
    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.
    "You and your mom are hillbillies! This is a house of learned doctors!"
  7. Master Droid
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    #6
    Quote Originally Posted by kevins686
    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.
    Exactly. That's what mine will do.
    Improving my RAZR MAXX one thread at a time.

    Aaron

    "A George divided against himself, cannot stand!
    !
  8. Senior Droid
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    #7
    Quote Originally Posted by aarong03 View Post
    Exactly. That's what mine will do.
    Aside from the initial drop from 100%, have you noticed whether your battery lasts longer overall when you charge it via USB?
    "You and your mom are hillbillies! This is a house of learned doctors!"
  9. Master Droid
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    #8
    Quote Originally Posted by kevins686

    Aside from the initial drop from 100%, have you noticed whether your battery lasts longer overall when you charge it via USB?
    Going try that starting this afternoon. I will advise later this week.
    Improving my RAZR MAXX one thread at a time.

    Aaron

    "A George divided against himself, cannot stand!
    !

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