Someone once said there is no such thing as a stupid question. I'm here to prove there is an exception to every rule. I have the standard battery 1 and battery 2 bank. I have seen no other batteries on the boat. I think my engine starts on one of those two batteries probably bat 1. I am several hours from my boat otherwise I would just go down to check. I have been reading about starting batteries and it started me thinking. Can someone clarify. Thanks much, Bill