just received my p4p and when I push the button in on the battery I have four green bars like it is fully charged. Is this ok? I thought it was supposed to come about half charged. I put it in the drone and turned my rc and go 4 app on then turned the drone on and it showed that I had 92% charge in the battery. Can the charger plug be inserted into the battery in either direction? When I plug it into the charger all the lights on the battery stay off is that because it is close to full charge? Thanks