I recently bought a new Q4 with 4.3l. Not the SF package (should have went this way and wouldnt have these issues). I was on the lake and playing the radio when the radio started to crack. Next thing I know is that I am being towed in because of a dead battery. Got a new battery (optima BLUE top) but want to add a auxillary battery for the radio, and other gadgets (thinking about a depth finder/fish finder). Going to do the Isolater and switch but where is a good spot to put a auxillary battery? Storage is a slim on these boats. Is a PWC battery sufficent for a radio and other electronics? Any suggestions.