Blown up Lipos
We have 5 at our field from this year, all have varying degrees of burn damage.
I would note all from misuse, damaged wires etc.
1 issue if you gun is not in top notch shape putting a high discharge 11.2 lipo in there will shred the gear box good.
Lipos have discharge rate on them 15c, 20c etc they get really high for use in RC helos etc. upwards of 65C. I would recommend 20c to 25C to start and see how your gun runs, and until you are used to them.
Then you can play with more fun batteries.