With my fire, I am certain I was charging the battery properly.. i.e. 2s pack charger said 2s. I saw it puffing while on the charger. Put it in the safe, put it outside (thank God) and went to bed. Tiny little pack smoked that doc safe. hate to see what one of the 7000 packs for my planes would do!

I do my best to only buy TP packs if I'm buying lipo. And I tossed all the off brand random ones I had.