New iphone/ipod charge adapters

The £20 Scosche passport sold on the apple store seem to have incompatibility issues with different USB plugs. I'm guessing it is the trickery on the data pin on the USB. Not sure if this one on ebay is better. Will be interested to know, but one thing for sure, Apple's newer iDevices are using more and more electricity and the iPad draws as much as 1A so some of the older USB plugs may not be supplying enough juice, especially for charging and using as SatNav at the same time.
 
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