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Having flown r/c for decades and being among the first to pirate cell phone batteries for use in r/c... There have been only 4 things that cause a lipo to vent. A short, poor solder joints, over-amping, and allowing the batteries to drop below the lowest safe voltage. Anything else is user error. The most common is over amping followed by low voltage. I also caution with cheap cells. I only buy balanced and matched packs. I have a pack with 2500 cycles that is nearly 9 years old. Still going strong. Maintain them, keep them within spec, won't fail you for many cycles.
Also, my longest flight has been 2 hours 20 minutes. Routinely flew 10-20 minutes full throttle, also no issues. Stay in spec, know your gear, treat it well, you will be fine.
We seem to be smoking the LiPo batteries in theses r/c aircraft. Initially they told us that it was caused by flying the airplanes longer than six minutes. We now have a DX9 controller that keeps track of the length of our flight and we're still zapping the batteries, at 35 bucks a pop. Weird.