Firewire Power adapter

Discussion in 'iPhone Accessories' started by millerrh, Jul 2, 2007.

  1. macrumors 6502

    Sep 14, 2005
    I've got a power adapter from an old iPod that uses the firewire cable. There's no reason this thing wouldn't work to charge the iPhone is there? The manual strictly states to use the USB power adapter, but that might just be for simplicity sakes since that is what it comes with.
  2. macrumors 68040

    Apr 6, 2006
    I would not do this. Firewire is higher voltage (9v vs 5v-USB)
  3. macrumors member

    May 3, 2007
    i've been using it:eek:

    i just wish it would synch through firewire
  4. thread starter macrumors 6502

    Sep 14, 2005
    I just checked the two power supplies:

    Firewire: Output 12V @ .67A
    USB: Output 5V @ 1A

    Definitely not the same. Oh well.
  5. macrumors 6502


    Jun 26, 2007
    Los Angeles
    i have been using a firewire adapter to charge my 5.5g ipod when i travel... and have the regular cable on the computer.

    nothing bad at all has happen... works just the same.... but not sure if i would try it with my iphone now that i know this....

    i did charge the iphone last night with an extra usb cable for the ipod and that worked well... but i guess the usb cables are the same? just a lil bigger for the ipod
  6. thread starter macrumors 6502

    Sep 14, 2005
    It is OK to use!

    I just spoke with a Genius at the Apple store about this and she said that it is perfectly safe to use it. The fact that the power brick outputs a higher voltage only means it CAN output that, but the power supply of the iPhone will only draw what it needs.

    So all those with firewire chargers are in luck!
  7. macrumors newbie

    Jun 18, 2007
    Funny, I tried it and my iPhone actually got kind of warm and it wasn't charging. :/

    So I'm just gonna stick with USB for now.
  8. macrumors newbie

    Jul 13, 2007
    I got the same result last time when I use firewire to charge it.
    Warm and not charing at all~:confused:
  9. thread starter macrumors 6502

    Sep 14, 2005
    maybe the geniuses aren't such geniuses after all!

    let me ask you guys this...when you tried it and it did nothing, did the lightning bolt show up in the icon like it was charging, but it just did nothing? cause i'm trying it right now and it "looks" like it is charging to me.
  10. macrumors newbie

    Aug 24, 2004
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A543a Safari/419.3)

    I've been using my firewire cable with no issues.

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