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Read: catch on fire, sometimes leading to a pretty violent explosion if they are packed tightly into something like a bike frame.

Having worked with high amp LiPo cells I have developed a unique appreciation of both their peak current output and their ability to strike fear into the everyone around them if you accidentally short them or start to see them ballooning/bulging.

My only run in with said fire was thankfully fairly minor, I spotted the pack looking a little buldged and summarily ripped it off the charger and dipped it into a 44 gallon drum. After about 60-90s it started smoking and caught on fire.

Don't fuck around with LiPos.