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Old 04-28-2008, 02:26 PM   #1 (permalink)
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Default Blackberry 8800/8820/8830 charging contact polarity

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Hi! I have a favor to ask regarding the side charging contacts. They aren't marked as to which is positive and which is negative, and I can't find any documentation on it.

Could somebody who has a charging cradle and a voltmeter check which contact is the positive one? I expect the voltage will be 5v to be compatible with USB, but I can find no indication whatsoever of the polarity. Thanks!

Terran
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Old 04-28-2008, 02:42 PM   #2 (permalink)
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I can only test for the Curve/Pearl (Don't think it helps you on the 88xx but thought I'd post anyway.)

Looking at the back of the BB: The contact on the right side is the positive side.

When I test my cradle I have to use positive lead on the left side contact-so right side contact on the BB.

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Old 04-28-2008, 09:01 PM   #3 (permalink)
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Thanks. It doesn't help me at the moment, but it will probably help somebody else who has that model and the same question.

I tested the 8800 some more and found conductivity from the bottom contact to ground on the USB port, so I went with that and confirmed empirically that the top contact is positive and the bottom contact is negative. There is a reverse diode between them, so if you connect things backwards, I believe it will short the supply and (theoretically) not damage the phone. I didn't try that, though, since I just paid full price for this phone last week.
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