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Seirenes - I am not quite sure what you mean by a "USB adaptor". If you are charging by USB, then it must be from a computer and you need to ensure your computer does not go to sleep (the 300 battery will simply stop charging and actually drain). From the mains you must use the mains input on the base of the 300.
It is not possible to charge from a mains through a USB adaptor to the USB input. This will simply leave the unit to discharge the battery.
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