General Wallplug vs USB

Discussion in 'Android Devices' started by plugnpl4y, Mar 9, 2010.

  1. plugnpl4y

    plugnpl4y Well-Known Member
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    Jan 5, 2010
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    It seems that when I charge my phone slower via USB it will hold a charge for a longer period of time when compared to charging more quickly via the wall outlet.

    To quantify a longer period of time: a typical wall outlet charge will deplete to 20% by the end of a normal week day (about 15 hours). A USB charge will last me over 24 hours on the same week day and then some (about 28 hours).

    Has anyone experienced this? I have a friend with a Droid who has tested my theory and agrees. We thought perhaps the slower charge is more efficient and less of a strain on the battery.
     

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  2. CarnageZ28

    CarnageZ28 Member
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    Feb 15, 2010
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    You are not alone ...

    I also noticed this. It def. gets better battery life from a USB charge for some reason.

    My computer is literally 3" from my bed though so charging there, and using the phone for an alarm is just convenient.
     
  3. TheSultan

    TheSultan Well-Known Member
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    Mar 6, 2010
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    Operations Manager
    Rochester, NY
    That's interesting, I've never done this test. What about a USB port that plugs right in to an AC outlet??
     
  4. mj_b90

    mj_b90 Well-Known Member
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    Dec 26, 2009
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    Uh... that's exactly what our wall adapter is :p

    I've never noticed holding a longer charge on the computer as opposed to outlet. It does take quite a bit longer to charge while on the computer though, I think.
     
  5. TheSultan

    TheSultan Well-Known Member
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    lol I deserve a good smack. I confess, I don't use it. I use a hard-wired AC adapter that originally came from my Blackberry Curve 8330.

    The USB cable that came with the AC plug sits in my car.
     
  6. xjken

    xjken Active Member
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    Jan 7, 2010
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    Engineer
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    I believe this is true (unless it's just in my head). The USB "trickle" charges the phone, vs. the wall outlet being a quick charge.

    I was big into RC cars and the battery charger had the option for trickle or fast. The trickle charge would always make the batteries last longer than a quick charged battery.
     
  7. SlickRick

    SlickRick Well-Known Member
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    Dec 29, 2009
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    Electronics Tech
    Eastern Shore of VA
    Perhaps the computer is like the trickle charger, I gotta try it. Also, should we limit using the car charger to .5 hours like my other cell phones? I know the car charger charges faster but the charge may not last long.
     
  8. Kevkelsar

    Kevkelsar Well-Known Member
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    Jan 11, 2010
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    I have experienced the exact opposite. My computer charges don't seem to last as long as my wall charges.
     
  9. LexusBrian400

    LexusBrian400 Well-Known Member
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    Mar 3, 2010
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    Automotive Electrical Technician / Mechanic
    I'm a drifter.. here and there.
    This is a known fact for all batteries. The slower you charge, the less heat produced, and the easier it is on the cells. Ask any mechanic :) Kind of the same principles as fast charging a car battery. Not a good idea, produces lots of heat, but it'll work. Trickle is always better.
     
  10. VonKannick

    VonKannick Well-Known Member
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    Feb 18, 2010
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    Smog Tech
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    I think I read in the users manual available online that the charge rate from USB is something like 450mA and from the AC adapter is about double that. Someone told me though that LiIon batteries don't too much care how you charge them, but I still prefer the slower charge, just to be safe.
     
  11. LexusBrian400

    LexusBrian400 Well-Known Member
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    Mar 3, 2010
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    Automotive Electrical Technician / Mechanic
    I'm a drifter.. here and there.
    Yes that is true that they are better at handling the "memory" problem that non-Li-ion batteries have, but as a general rule, slower charging amperages are usually better no matter what type of battery.
     
  12. plugnpl4y

    plugnpl4y Well-Known Member
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    Awesome! Good info here. It feels good to know I'm not crazy...
     
  13. DocTauri

    DocTauri Well-Known Member
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    Nov 29, 2009
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    According to what I have been able to find on the web, a standard USB port is 5v/500mA, whereas the charger that comes with the Eris is 5v/1A (1000mA). I'm no electrical guy, but I would guess this means that the USB port should charge about half as fast.
     
  14. truelove79

    truelove79 Well-Known Member
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    Feb 12, 2010
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    Electrical Engineer
    Peoria, IL
    That is correct.
     

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