The device is apparently notorious for having batterie not charging issues.what seems to be a solution is using original charger and or original moto usb cable for your P.C..Theres a diagram you can Google showing a fix for the modified connector you can fix on a generic usb cable.it consist of soldering a resistor to a couple of the traces on a connector to enable the device to sense its in charging mode.While I havent done this fix,its posted by quite a few people on line.