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Generally a wall adapter is quicker for charging provided you get one that is greater than 500ma output.
For the first few charge/discharge cycles it can take some time for the battery to calibrate. A charge I did 2 months ago on my computer for 7 hours and not fully charged, so I ended up charging it overnight. By morning it was done.
The battery indicator will change from the lightening bolt to what looks like a power plug when finished charging. I suggest don't worry and just let it charge overnight if you can.
As a side note, make sure when charging your PC does not go to sleep, this will cause the USB ports to turn off and consequently not charge the reader.
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