The charger for my 18v DeWalt was being used, and they apparently light off sometimes. It was sitting on my metal bolt bin, but I had parked my cutting torch next to the bin, and I must have left a tank valve on. I had one of my security cameras on the shop window and it showed a smallish flickering fire, then a bit larger, then the window blew out and it looked like a jet engine started in the shop when the torch tanks lit off. It was about 2 AM and the roar of the tanks woke me up. The local volunteer firemen showed up in 11 minutes, but by then my oil and fuel storage had got going, about 20 gallons of oil and hydraulic fluid (I farm) and about the same in diesel and gas. The heat broke two windows in the house, and the roof shingles were smoking when the vol firemen arrived, so they saved my home. Basically just a light duty near miss, but a jolt. Makes me realize what a civilized life we live. I appreciate that we don't have all the terrorists and war going on here, like so much of the world. Thanks to those that stand on the walls, and those that come to our aid. We got a good place to live cause of them. I don't thank them enough.