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Just to chip in, the NT will charge from the USB cable when connect to a PC; it is not mentioned in the guide because the consumption of the device while in use is greater than the 0.5A the PC is providing, so the NT is actually discharging when in use and connect to a PC, though at a lower rate than if not connected at all. If you do not use it, then it will charge the battery, but much slower than a wall charger (about 4 times slower).
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