I have an used phantom 2 flown it a couple times : 1. first flight after about 13 minutes total time after turning it on I was watching it just a few feet above the red light blinked once then it went into auto land mode. I was able to catch it before it hit the fence. 2. Yesterday I was flying I did a short flight over some water then got chicken and moved to a new location on the same battery. when i took off i had three solid lights and the 4 blinked ? I believe. after a short flight in kind of heavy wind I went to fly back. the phantom was slow coming back so I am sure it was under full load fighting the wind. As this point it stopped wanting to rise so when the right stick pulled fully back I could not make it lift. I stopped it for a few seconds it stayed level I could moved left and right but no higher. I could not see the lights to determine if they were blinking red .. after about 5 seconds it started to auto land, actually I am not totally sure if it stopped going up and I brought it down just to be safe. it was kind of a quick thing where as I came down i was already prepping to land there just to be safe. there were a few things going on like a I needed to fly low across the street to get back to where I was and there was a truck coming. After I took it home in my yard i fly again on this batter for another 5 minutes at least without issue .... the the battery was used ... and has about 30 cycles on it. I am wondering if I have a bad phantom ? for example maybe this is why it was used because it crashed and broke due to what I am seeing ? also how do I test a battery. The weird thing is a couple flights I have had without issue at all. It has made me really nervous or afraid to fly anywhere I might not be able to land immediately.