Travel Technology - USB Wall and Cigarette Charge

Hey All:

Quick question regarding USB charging.

I have a 3G iPhone. Of course it charges via my PC's USB.
Also came with Apple 110-240 wall adapter.

I also have the

Jawbone 2 (USB into wall adapter) and some random accessory DC-USB cigarette lighter adapter (wish I new what it used to go with).

The funny thing is all the "output" seems to be different.
5.3V DC
5.0V 1A
5.0V 550 mhA

I do not want to stick my 3g into bad charge and fry it. So the question is is is safe charge my 3G in any of the above as well as other USB supporting devices?

This is not horseshoes and I don't want to make a mistake just by being close.

Thanks, Scho

I use various USB-AC/DC/Cigarette chargers with my iPhone 2G (including the Jawbone charger) and haven't had a problem. That is not to say that I've checked whether they have different outputs.

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.

Those ratings are within the acceptable range. The bigger issue is will the iPhone work with the charger? Many USB chargers only put voltage on the two power pins and simply leave the data pins unconnected. This won't work for the iPhone, it wants to see a voltage on the data lines as well. I think this is also true of some Blackberrys.

Thanks. I will check.