ORIGINAL: Pah co chu puk
It's a 4500 ni-mh battery. I charged it up yesterday before I headded up into the mountains. Worked for 30 seconds in the morning but would not start when I got there. I'm charging a fresh one now.
Altitude sickness?
Certainly a good battery size.
I don't know what Tx you are using, but if I don't remember to center the left stick on my DX6i before I start up (and I usually don't), I end up starting the config protocol. Not saying that's the issue, just relaying everything that was weird for me and had an explanation.