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.
To this real fast