I've had this problem with my OEM batteries for a while now, I've since bought a P4p, so my P2 issues have been on the back burner. Trying to resurrect it now as a backup bird. I charged a battery and got Not Intelligent Battery. I have 2 other batteries that work fine. I took one of the working batteries and put it in the P2 started it up, pulled out the battery and put it the non working battery and suddenly I had communication with the non-communicating battery. I'm running the battery down now to 8% in hopes of resetting it. It's been running for 16 minutes in the house without props. Any other suggestions?