Greetings. I have a VP2+ and two batteries. I have flown at our local high school on Both batteries with out any problems. I went for a flight the other night and one of the batteries would not power up the bird and gave me flashing red lights indicating some type of error. I packed up went home and with that same battery that gave me the error did a test flight. The bird powered up and flew just fine. I can't seem to figure out why the battery will no longer work at the school but both work just fine at other locations. Any ideas or thoughts are greatly apperciated.. cheers!