I learned and expensive lesson, that i already knew.
Everyone says lithium polymer batteries can be dangerous. I was letting some new drivers drive e buggy for the first time and had an older 2s pack for my wheeler charging on the bench, older but IR under 4-5 per cell, tiny puff that is normal with some, I wont say, brands. I knew betetr then to leave it, but was having a good time I Looked up from the track and saw a plume of smoke and knew what it was immediately, luckily all i lost was a table, pit mat, I charger and my phone which was charging off the power supply. Watch your charging batteries, don't charge in your car, this could have been much worse.
from this
To this real fast