Original USB cable is missing something??? Not a firewire/usb issue!

This is what happens: can anyone explain?
I have two chargers with USB port (one in-car and one portable battery) that do not work with iphone 3g when the original white usb cable is attached; I don't get any message: they just do not charge the iphone. I even tried to use a different cable from my ipod but still... Then I tried to use the cable that came with the Proporta portable charger and guess what: _both of them now charge my iphone_!
So: what is exactly missing in the Apple cable?
And: where can I find another cable that works with 3rd part usb chargers?

Some USB power sources, even though they have the correct voltages, do not work. This is because they don't support USB negotiation, which allows devices to determine the precise capabilities of a host adapter. (this is unrelated to the USB vs FireWire charging issue.) Since the device doesn't respond to the iPhone's attempt to negotiate, the phone assumes it's not compatible.
Not sure how using that different cable could affect it, unless the cable itself has some circuitry in it to handle the negotiation.
PS
Here's some info from Wikipedia:
"There are also devices at the host end that do not support negotiation, such as battery packs that can power USB powered devices; some provide power, while others pass through the data lines to a host PC. Some of these devices can supply up to 1 A of current. Without negotiation, the powered USB device is unable to inquire if it is allowed to draw 100 mA, 500 mA, or 1 A."

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Original USB cable is missing something??? Not a firewire/usb issue!

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