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Thread: USB Wall and Cigarette Charge
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Old Jul 28, 2008 | 8:45 am
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gfunkdave
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The official standard for a USB connection (AFAIK - I haven't looked it up) is 5v, 500 mA.

I think each rating you mention is the maximum that that device will output. If your device-to-be-charged doesn't need that much, it won't draw that much.

If you plug any mini-USB device into a mini-USB plug, you should be fine. I mix and match mine all the time.
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