Pilar
I put in a battery switch a while back and it is nice to know it will put out an electric fire, I didnt know that. I turn it off every time I park the boat.
I put mine in after my little boy while playing in the boat turned the key to the on position without me noticing. It added 180 +/- hours to the hour meter before the battery went so dead it wouldnt run the hour meter any more.

I discovered this little problem at the boat ramp. Ever pull start a 115 HP outboard with good compression.