Just a little something omitted from the latest manual - it doesn't indicate if you need the power switch on the transmitter (V3) turned on or off while charging with the USB cable? If I have the power switch on, the four LED's cycle up repeatedly which seems to indicate that it is charging. With the switch off the power LED stays red and the batt level LED's stay off. I just want to know if it is actually charging with the power off and the USB connected?