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Charing an iPhone 3g with batteries Answered

Hi all, I've been trying to charge my iPhone 3g with AA batteries. I have the batteries, which are producing 6 volts and about 2700 millamps hooked up to a 5 volt, 1 amp regulator. Then I have the output of the regulator hooked up to a female usb, which charges my friend's phone fine (generic samsung). However, when I hook it up to my iphone charger, it doesn't seem like its charging and the charging screen does not come up. Does anyone know what the problem is? Thanks,

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