I got a replacement PCC today as my other one didn't seem to work. It stayed red and never went green or flashed. So I plugged my new one into the USB and it stayed red and just went to green. Basically the USB is to charge my PCC right? Also I have put a batt in the PCC and the light is still red. Does it change to green when fully charged? This battery showed fully charged on the normal charger but now it shows red on the PCC.