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Thread: External battery? Help me decide...

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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 :
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  1. #21
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    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 Attached Thumbnails External battery? Help me decide...-sans.titre.jpg  
    Last edited by Rivest; 04-30-2008 at 07:55 PM.

  2. #22
    Green Apple
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    http://cgi.ebay.com/2200mAh-EXTERNAL...QQcmdZViewItem


    Iam using this one and I love it, it works great its a must have..

  3. #23
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    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?

  4. #24
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    i like the 3rd one
    If i helped hit Thanks!

  5. #25
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    Quote Originally Posted by robbienakata View Post
    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.

  6. #26
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    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?

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  7. #27
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    Yeah don't follow mine because I said it didn't work. I would love to help you but I need help first

  8. #28
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    Quote Originally Posted by Aiyo View Post
    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.
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  9. #29
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    Yeah! I got it working using the diagram on the first page. Thanks to everybody who helped

  10. #30
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    Hmm only if we could do this so it would go straight into the 30pin..

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  11. #31
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    You can, just use usb to 30 pin cable cut the usb plug and solder it to the battery pack.
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  12. #32
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    Quote Originally Posted by Aiyo View Post
    Hmm only if we could do this so it would go straight into the 30pin..
    What do you mean with the 30pin?!?

  13. #33
    Livin the iPhone Life Aiyo's Avatar
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    Its the part that plugs into iphones and ipods.

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  14. #34
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    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

  15. #35
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    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!

  16. #36
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    Quote Originally Posted by iBlade View Post
    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?

  17. #37
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    Quote Originally Posted by boudy View Post
    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.
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  18. #38
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  19. #39
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    Go with option two...

    My bro bought it and it is lightweight, affordable, and works like a charm.

  20. #40
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    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...

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