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Discuss 2g, New Battery, Problems Booting at the Hardware - Hackint0sh.org; A friend gave me her non-working 2g recently. Yesterday I changed the battery and things ...
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    Default 2g, New Battery, Problems Booting

    A friend gave me her non-working 2g recently. Yesterday I changed the battery and things worked well for about a half hour (i.e., it booted, played music, took photos, etc.). I connected it to a charger and the battery meter indicated that the battery was almost full.

    However, as time goes on it's behaving as if the battery is dead-it keeps turning off, when I reset it (sleep/home) the apple comes on and then the screen goes black after 10 seconds or so. Last night it would boot when plugged in, but this morning it doesn't even do that. So, at the current time I can't even get it to show the apple. Right now I can't even connect it to iTunes.

    The voltages on the battery are:

    Unplugged:
    black-red: 4.13 v
    black-white: 0.0v

    Plugged in (via wall charger):
    black-red: 4.13v
    black-white: 2.3v

    If I understand things correctly, the battery is charged (i.e., the black/red voltage is good).

    I've looked through this forum and couldn't find any symptoms exactly like this. Any thoughts/suggestions/hints from anyone?

    Thanks!!

    --Doug



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    I think I found the problem with my iPhone but would appreciate a quick confirmation. When I power on the iPhone it does a cycle of "apple, black, apple, black, etc.". I recruited a second set of hands to help hold the volt meter leads while I pressed the iphone buttons and noticed that the red-black voltage oscillated from 4.2 to 3.0 volts during this cycling. (When the iPhone is completely off the red-black voltage is a steady 4.2 v.)

    My conclusion is that my "new" battery is a dud; is this a reasonable conclusion? Before I contact the ebay seller I wanted to confirm that there aren't other likely candidates for the behavior I'm experiencing.

    Thanks for any help.

    --Doug

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    Voltage is not indicative 100% that the battery is charged. Amperage draw that you can sustain would be the biggest tell. Even a poorly charged 12V battery will provide ~12V even as it is about to die, the thing that you'll see is that the amperage will decrease substantially. This is why when batteries die, it doesn't blow the equipment up. Cheap devices without proper voltage regulators could blow up if you apply +5V where it's expecting +12V. Sure, it's rare, but still.

    In this case, I'd see if you can measure the amperage to see what the current draw is. If you're getting solid current draw, it could be something else. If you watch the current draw for just a moment and it tanks like a stone, it's an indicator that your battery could be shot.
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