1. Rivest's Avatar
    Well I just tried it but it didn't work. Not even my ipod nano charges. I surely did something wrong. I used Yellow-Purple-Yellow resistor. Here's what I made :
    Attached Thumbnails External battery? Help me decide...-sans.titre.jpg  
    Last edited by Rivest; 2008-05-01 at 04:55 AM.
    2008-05-01 04:25 AM
  2. diazjoaquin's Avatar
    http://cgi.ebay.com/2200mAh-EXTERNAL...QQcmdZViewItem


    Iam using this one and I love it, it works great its a must have..
    2008-05-01 05:38 AM
  3. robbienakata's Avatar
    So I've run into an issue. Once the batteries are drained from the pack it seems to suck the juice out of my phone. Would a simple diode fix this problem?
    2008-05-01 06:53 AM
  4. julianqm2's Avatar
    i like the 3rd one
    If i helped hit Thanks!
    2008-05-01 07:15 AM
  5. iBlade's Avatar
    So I've run into an issue. Once the batteries are drained from the pack it seems to suck the juice out of my phone. Would a simple diode fix this problem?
    Yes it would fix it. It's just that a average diode consumes about 0.7volts meaning your charging voltage drops by 0.7volts.
    Don't be shy if I helped you use the Thanks button, I do it.
    2008-05-01 09:44 AM
  6. Aiyo's Avatar
    Ok I am going to for sure try this and I would like to try it with a diode and the resistors. Would one of you be willing to make a dummies diagram for this? Almost something like rivest's diagram, but more clear?

    If I ever helped you or made a comment you like, press the "thanks" button!
    320GB HD 4GB RAM 2.2GHz Macbook
    500GB HD 4GB RAM 2.6GHz Macbook Pro
    2008-05-02 10:07 AM
  7. Rivest's Avatar
    Yeah don't follow mine because I said it didn't work. I would love to help you but I need help first
    2008-05-02 03:01 PM
  8. iBlade's Avatar
    Ok I am going to for sure try this and I would like to try it with a diode and the resistors. Would one of you be willing to make a dummies diagram for this? Almost something like rivest's diagram, but more clear?
    Check my post number 11 on page one. If you want to use a diode also just splice it into the positive (red) wire comming from the battery pack. The diode is directional meaning only lets current flow one way. You have a stripe on the diode on one side that side has to be on the phone side.
    Plus from the battery ------[___I_]------going to the usb plug.
    Don't be shy if I helped you use the Thanks button, I do it.
    2008-05-02 04:15 PM
  9. Rivest's Avatar
    Yeah! I got it working using the diagram on the first page. Thanks to everybody who helped
    2008-05-03 10:27 PM
  10. Aiyo's Avatar
    Hmm only if we could do this so it would go straight into the 30pin..

    If I ever helped you or made a comment you like, press the "thanks" button!
    320GB HD 4GB RAM 2.2GHz Macbook
    500GB HD 4GB RAM 2.6GHz Macbook Pro
    2008-05-04 12:02 AM
  11. iBlade's Avatar
    You can, just use usb to 30 pin cable cut the usb plug and solder it to the battery pack.
    Don't be shy if I helped you use the Thanks button, I do it.
    2008-05-04 12:17 AM
  12. Rivest's Avatar
    Hmm only if we could do this so it would go straight into the 30pin..
    What do you mean with the 30pin?!?
    2008-05-04 01:28 AM
  13. Aiyo's Avatar
    Its the part that plugs into iphones and ipods.

    If I ever helped you or made a comment you like, press the "thanks" button!
    320GB HD 4GB RAM 2.2GHz Macbook
    500GB HD 4GB RAM 2.6GHz Macbook Pro
    2008-05-04 08:11 AM
  14. kys's Avatar
    I have the geekpod 100. It works well, but cost more. 6000mah lion battery. The only problem I found is if I leave the adapter plugged into the battery without connecting ipod/iphone the battery drains. Other than that, no problems.

    http://www.batterygeek.net/ProductDe...%5F100%5FWHITE
    2008-05-06 12:16 AM
  15. FlashCus's Avatar
    Please help! I stumbled onto this thread whilst searching the net for a problem with my charger! I am using 4 AAs that are pretty much fresh. When everything is set up (im using 560 or 530k resistors i don't remember) charging initializes, but it doesn't actually charge...I checked the voltage and when the ipod isn't plugged in my battery pack gives 5.1v, when it should give 6 and when the ipod is plugged in, 4.1v. It really doesn't make sense. If i use a 5v regulator i get exactly the same results...I don't get it, my resistors are in parallel (obviously) i have no diode, why is this happening?

    Cheers!
    2008-05-31 06:31 PM
  16. boudy's Avatar
    Sorry guys, did not want to hold out on you. But I was riding my new Bike a Hyosung GT250R all day. Anyway I just drew up something for you. It is really simple and easy. If you need any further help just ask. You can use any case that holds 4 AA batteries. You need 2 resistors each 470 kOhm and any female USB cable. This way you can charge anything that needs 5 Volt. The resistors you need to trick the iphone to accept the charge. Here is also a site that shows the pinout for USB.
    USB Pinout

    But be carefull guys, don't damage your phone.
    Thanks for the iphone charger tip.
    I tried it but did not have 470K resistors so used lower value (47K)
    It works great on my nano, but not on my iphone;
    is the resistor value of 470K critical?
    2008-06-01 03:11 PM
  17. iBlade's Avatar
    Thanks for the iphone charger tip.
    I tried it but did not have 470K resistors so used lower value (47K)
    It works great on my nano, but not on my iphone;
    is the resistor value of 470K critical?
    Yes it is. With 47K you're letting ten times as much current into the serial port of the phone, you can damage the phone by doing so! Please if you are not sure what you are doing, do not try stuff out. Read the whole thread, I mentioned it several times. I do not want anybody damaging their phone. You need 470k or close to it.
    Don't be shy if I helped you use the Thanks button, I do it.
    2008-06-01 03:35 PM
  18. GodMystic's Avatar
    2008-06-01 05:46 PM
  19. kamy's Avatar
    Go with option two...

    My bro bought it and it is lightweight, affordable, and works like a charm.
    2008-06-02 01:12 AM
  20. amddude's Avatar
    Charger I made

    Code:
    ,--[___+_]-------,---,-----|POWER USB
    '--[_+___]-,     |   |     |
    ,--[___+_]-'     R1  R1----|DATA USB
    '--[_+___]---,    '--------|DATA USB
                 '-------------|NEGATIVE POWER USB
    I used 470K ohm resistors for R1 and it didnt work. THe ipod kept changing from charging to Plugged rapidly and it didnt do much else. I also tried 100K ohm for R1 and it also did the same thing. Someone said the pins can only handle 3 volts (data) but when I tested it with a voltmeter (not much of a load) it showed NO voltage at all. Hmmmmm...
    2009-10-29 07:38 AM
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