Eeeek. I was actually thinking of trying to wire it into the mains. 240 volts seems like fun.I would be more worried about something causing a short. Like maybe the wire comes loose, or as someone else had happen a small wire clipping unknowingly fell into the tank and seemed to work fine until later when it moved between a post and the side wall and caused a short. Not trying to scare you (or anyone else) but sometimeshappens and Murphy's law presides. I am not familiar with the HOG so maybe it has some sort of fuse in it, if not, I would find a way to install one.
I don't think the HOG does have any kind of fuse, worst thing is when you do change the batteries for a brand new set and it blows your brain because you've not realised just how much capacity your old batts had lost over time. Perhaps I should take a cue from my colleagues' incredulous expression on his face when it flashed over and spat a 6" flame through the drip tip yesterday and I just re-dripped and carried on.