Don't get me wrong. This isn't intended to be a slight against 3DR in any way. I've never had anything but pleasant dealings with them. It's just a very interesting occurrence with my Iris+ from earlier today.
After about 6 minutes of flying hard banks around my yard, I decided to land. Unfortunately, I ran out of altitude before I ran out of airspeed, and the resulting touchdown, in an uneven area, caused my Iris to flip onto it's back. Almost immediately after flipping, smoke began to pour from the shell, and before I could get to it, flames erupted from the underside, by the PDB. I pulled the battery and extinguished the fire, and then returned to my workbench.
Upon opening the shell, I discovered a great deal of scorching around the PDB, and several wires were off their connectors. Not sure what came first, the broken wires or the fire, but it should be interesting to hear what 3DR says.
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The video is at the YouTube noted in my post, or you can check it out at http://diydrones.com/video/upinsmoke.
Never seen that before. Clearly the battery caught fire.
Great (accidental) camera work BTW
Actually, at the end of the video, I was removing the battery, and it was fine. No indication at all of what it had just been through.
Sorry for your loss.