Quote:
Originally Posted by DaleDe
Generally the USB standard is designed for a computer interface and supplying a small amount of power to an attached device. It was never designed to be for charging devices, after all who would buy a computer to charge a cell phone.
However, as we all know standard things get used in non-standard ways. While USB isn't designed to output more than 100 mA to a device and later modified to 500 mA many devices with USB connectors on them need more than that. In addition the standard didn't provide for charging a device and using it independently from the computer it is plugged into. However, customer needs and desires have modified the use way beyond the standard and manufacturers are going with the flow. I guess you want to pay more for an additional non-standard connector to charge your device.
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Yeah, I have a Bluetooth GPS receiver for use with my N800 and my computers that charges via USB. It comes with a car charger that outputs 1100mA, and it makes a difference apparently for the GPS unit. It has a label on the side of the charger, that clearly states that.
Also, just because there is a standard, doesn't mean it has to be implemented.
As far as the being useless while connected via USB, well, that has nothing to do with the standard. Most of those do that for data protection reasons. they don't want the device to be using a file, and the computer edit it (thus causing a crash), or something like that. My N800 locks out the SD cards from being used if I plugged in via USB, for that reason.