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More and more devices begin to take advantage of USB sockets as a charger, but sometimes a USB charger does not work because the socket does not have high enough power (output). This usually happens on a laptop, or USB sockets in the front of a desktop.

My question is how to determine if a USB socket is qualified for charging, besides exhaustive testing.


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up vote 4 down vote accepted

Dell notebooks (at least in their Lattitude line) have a small lighting bolt next to the USB label which indicates is a higher power charging port. I would hope other notebook manufactures do similar labeling.

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