FINALLY got a P4! So excited. It was open box but I think it's never been used cause the props still have the plastic on. I have a few questions; - I had a little trouble pushing the battery in. The lower clip would kind get stuck out unless I push on the lever in. Is that normal? - the battery while locked in is a little loose by a few milliliters.. Is that normal? - the phantom name is p4.. Did you have to name it and register upon first use? - and lastly, is there a way to know if the p4/battery have been used before? Battery shows zero charges. Thank you!!