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donob10 · 12-14-2010, 06:02 PM

It's not complicated. USB defines both Volts and and milliamps of current. The standard is 5.00 volts and 500 milliamps. Even a laptop with low battery would output to that standard. DC-DC converters are used to get to 5.00 V from the laptops higher battery voltage.
The nook wall charger does put out 800 mAmp, rather than the standard 500. That is to allow faster charge. Care should be used before using the nook wall charger to charge anything else, like a cell phone. The higher charge rate could be a problem in a smaller battery.
The "Igo" emergency charger does provide 5.0 Volts (DC-DC converter) and 500 mAmps and can be used with any "USB" chargeable device. It has other "taps" to provide other voltages through other tips.
There are two USB micro connectors. Micro-A and Micro-B. Micro-B is the one on nook. It is the more common one. There are no Standard A (computer or nook wall charger) to Micro-A (nook size) cables. So you cant get the wrong one, if you get Micro.
..
I think things are looking too complicated. It isn't. The earlier reference to USB A/Micro-B connector is an error. USB A/Micro-B defines a cable not a connector. Loose language makes confusion. Every nook comes with that cable.

12-14-2010, 06:02 PM	#5
donob10 Member Posts: 24 Karma: 20 Join Date: Sep 2010 Device: nook	It's not complicated. USB defines both Volts and and milliamps of current. The standard is 5.00 volts and 500 milliamps. Even a laptop with low battery would output to that standard. DC-DC converters are used to get to 5.00 V from the laptops higher battery voltage. The nook wall charger does put out 800 mAmp, rather than the standard 500. That is to allow faster charge. Care should be used before using the nook wall charger to charge anything else, like a cell phone. The higher charge rate could be a problem in a smaller battery. The "Igo" emergency charger does provide 5.0 Volts (DC-DC converter) and 500 mAmps and can be used with any "USB" chargeable device. It has other "taps" to provide other voltages through other tips. There are two USB micro connectors. Micro-A and Micro-B. Micro-B is the one on nook. It is the more common one. There are no Standard A (computer or nook wall charger) to Micro-A (nook size) cables. So you cant get the wrong one, if you get Micro. .. I think things are looking too complicated. It isn't. The earlier reference to USB A/Micro-B connector is an error. USB A/Micro-B defines a cable not a connector. Loose language makes confusion. Every nook comes with that cable. Last edited by donob10; 12-14-2010 at 06:33 PM.