I was working at a shop my buddy owned and had run a skid steer in so I could compare it with the one I was working on, I was doing a complete overhaul on a similar model. The boss comes in and tries to start the one I had brought in but the battery was dead according to him. Well he hooked up the cables backwards with the charger on full power and then bang. The battery blew up so hard I was twenty feet away and felt the blast and was covered with the mist of battery acid. He ended up going to the hospital to get his eyes and face taken care of.