Emergency Chargers

Discussion in 'Android General Discussions' started by Scribble, Jan 21, 2010.

  1. Scribble

    Scribble Member

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    Hi All- have any of you had any luck with those emergency cell phone chargers? The ones that are just a AA battery inside a tube with a USB port on it?

    My company gave me one as a door prize at a conference recently, but it doesn't seem to do anything... The droid wakes up kind of when I plug it in, but no charging info displays.

    I assume a AA battery is just too weak to charge it?

    Or is it actually charging, just not enough to display the info?
     
  2. Backnblack

    Backnblack Premium Member
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    Takes 850ma to charge the Droid IIRC....

    AA's have 2700 (alkaline), 1100 (carbon–zinc), 3000 (LiFeS2), 1700–2900 (NiMH), 600–1000 (NiCd) mA
    But I doubt enough to give more than a mild boost...
     
    #2 Backnblack, Jan 21, 2010
    Last edited: Jan 21, 2010
  3. Martin030908

    Martin030908 Super Moderator

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    854 to be exact :)
     
  4. Scribble

    Scribble Member

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    How does it charge by USB then? I thought max for USB draw was 500?
     
  5. Backnblack

    Backnblack Premium Member
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    But USB is continuous....The AA just keeps going down.

    Also I believe the Droid knows when it's charging off of USB.
     
  6. Istus

    Istus Member

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    A quick Wiki search says typical alkaline batteries have a capacity of about 1700 mAh to 3000 mAh while zinc carbon batteries range from 400-900 mAh.
     
  7. Backnblack

    Backnblack Premium Member
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    Guess it depends on the Wiki. Here is the one I saw...
    List of battery sizes - Wikipedia, the free encyclopedia
     
  8. TxDoc

    TxDoc Active Member

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  9. Istus

    Istus Member

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  10. justbob

    justbob Member

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    The real problem is that a single AA battery only delivers 1.5v. USB is 5v. You can step the voltage up, but doing so will cost you amperage. I can't imagine that charger could provide much of a boost to the Droid at all.
     
  11. Scribble

    Scribble Member

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    Seemed to work fine for the various blackberries at the conference, but my poor droid couldn't get a quick fix. :(

    (At least my friend's iphone was out of luck as well! :D)
     
  12. Guchi

    Guchi Active Member

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